Each year, tornadoes that touch down are recorded. The following table gives the number of tornadoes that touched down during each month of one yout, Determine the range and sample standard deviation

Answers

Answer 1

To determine the range and sample standard deviation of tornadoes that touched down during each month of one year, we need to use the data in the table.

However, the table is not provided in the question.

Please provide the table with the number of tornadoes that touched down during each month of one year so I can help you with your question.
To determine the range and sample standard deviation of the number of tornadoes that touched down each month, you'll first need to provide the data in a table format.

Once you provide the data, I can help you calculate the range and sample standard deviation.

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Correct question:

Each​ year, tornadoes that touch down are recorded. The following table gives the number of tornadoes that touched down during each month of one year. Determine the range and sample standard deviation.

3 2 41 115 197 95

70 85 68 64 110 91

Range?

Sample Standard Deviation?


Related Questions

Arnold owns a hat with a circular brim. The brim has a diameter of 12 inches. What is the circumference of the brim of Arnold's hat, in inches? Use 3. 14 for the value of π. Enter the answer as a decimal in the box

Answers

The circumference of the brim of Arnold's hat is 37.68 inches.

What is circle?

A circle is a geometric shape that consists of all points in a plane that are equidistant from a fixed point called the center. It can also be defined as the set of points that are a fixed distance (called the radius) away from the center point. The distance around the circle is called its circumference, and the distance across the circle passing through the center is called its diameter.

The circumference of a circle can be calculated by the formula C = πd, where C is the circumference, π is the mathematical constant pi, and d is the diameter of the circle.

In this case, the diameter of the brim is 12 inches, so we can substitute that value into the formula:

C = πd

C = 3.14 x 12

C = 37.68

Therefore, the circumference of the brim of Arnold's hat is 37.68 inches.

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Suppose $40,000 is deposited into an account paying 2. 5% interest, compounded continuously.



How much money is in the account after eight years if no withdrawals or additional deposits are made?

Answers

The formula for calculating the amount of money in an account with continuous compounding is:

[tex]A = Pe^{(rt)}[/tex]

where A is the amount of money in the account, P is the principal (initial deposit), e is the mathematical constant e (approximately equal to 2.71828), r is the interest rate (expressed as a decimal), and t is the time (in years).

Plugging in the given values, we get:

A =[tex]40000 * e^{(0.025 * 8)[/tex]

Using a calculator, we find that [tex]e^{(0.025 * 8)[/tex] is approximately 1.2214, so:

A = 40000 * 1.2214 = $48,856.12

Therefore, the amount of money in the account after eight years with continuous compounding is $48,856.12.

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X is 6 more than twice the value of Y and other equation is 1/2x+3=y what is the solution to puzzle

Answers

Let’s solve this system of equations. From the first equation, we have x = 6 + 2y. Substituting this into the second equation, we get 1/2(6 + 2y) + 3 = y. Solving for y, we get y = -6. Substituting this value of y into the first equation, we get x = 6 + 2(-6) = -6. So the solution to the system of equations is (x,y) = (-6,-6).

Kelsey's favorite crackers are available in two different sizes. Which coupon should Kelsey use to pay the lower price per ounce for the crackers?

Answers

Using the coupon that offers a $0.50 discount on the larger package would yield the lowest price per ounce at $0.1875. Kelsey should use this coupon to get the best value for her favorite crackers.

Kelsey has two options when it comes to purchasing her favorite crackers, and she needs to determine which coupon will result in the lowest price per ounce. To make an informed decision, Kelsey should compare the price per ounce of both cracker sizes and apply the appropriate coupon accordingly.

First, Kelsey should find the price per ounce for each size by dividing the total price of the package by the total number of ounces in the package. For example, if the smaller package costs $2.00 and contains 8 ounces of crackers, the price per ounce would be $2.00 / 8 = $0.25 per ounce. Similarly, if the larger package costs $3.50 and contains 16 ounces, the price per ounce would be $3.50 / 16 = $0.21875 per ounce.

Next, Kelsey should determine the discount offered by each coupon and calculate the new price per ounce after applying the respective coupon. For instance, if one coupon provides a 10% discount on the smaller package, the new price per ounce would be $0.25 * (1 - 0.1) = $0.225 per ounce. If another coupon offers a $0.50 discount on the larger package, the new price per ounce would be ($3.50 - $0.50) / 16 = $0.1875 per ounce.

Finally, Kelsey should compare the adjusted price per ounce for both packages and select the coupon that results in the lowest price per ounce. In this example, using the coupon that offers a $0.50 discount on the larger package would yield the lowest price per ounce at $0.1875. Therefore, Kelsey should use this coupon to get the best value for her favorite crackers.

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On the set of axes below, solve the following system of equations graphically and state the coordinates of all points in the solution set.

Answers

The solution to the system of equations shown above is the ordered pairs [-2, -9] and [3, -4].

How to graphically solve this system of equations?

In order to graph the solution to the given system of equations on a coordinate plane, we would use an online graphing calculator to plot the given system of equations and then take note of the point of intersection;

y = -x² + 2x - 1   ......equation 1.

2x - 2y = 14 ......equation 2.

Based on the graph shown in the image attached above, we can logically deduce that the solution to this system of equations is the point of intersection of the lines on the graph representing each of them, which is given by the ordered pairs (-2, -9) and (3, -4).

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A rectangle with length n is inscribed in a circle of radius 9. Find an expression for the area of the rectangle in terms of n

Answers

Using pythagorean theorem the area of the rectangle in terms of n is given by A = n√(324 - n^2).

In the given scenario, we have a circle with a diameter that is twice the length of the radius, which is stated as 18. The diagonal of the rectangle is also the diameter of the circle, so it measures 18. Let's assume the width of the rectangle as 'w'. By applying the Pythagorean theorem, we can establish the following relationship:[tex]n^2 + w^2 = 18^2[/tex] = 324, where 'n' represents the length of the rectangle.

To solve for 'w', we rearrange the equation: [tex]w^2 = 324 - n^2.[/tex] This equation allows us to calculate the width 'w' of the rectangle when we know the length 'n'.

The area of the rectangle, denoted as 'A', is given by the formula A = nw, where 'n' is the length and 'w' is the width of the rectangle. By substituting the expression for w^2, we obtain: A =[tex]n\sqrt(324 - n^2).[/tex]

This equation represents the relationship between the length 'n' and the area 'A' of the rectangle, taking into account the given information about the diameter of the circle, which is also the diagonal of the rectangle. By solving for 'n' and substituting it into the formula, we can determine the area of the rectangle.

Let the width of the rectangle be w, then by the Pythagorean theorem, we have:

[tex]n^2 + w^2 = 18^2[/tex] = 324

Solving for w, we get: [tex]w^2 = 324 - n^2[/tex]

The area of the rectangle is given by:

A = nw

Substituting the expression for w^2, we get:

A =[tex]n\sqrt(324 - n^2)[/tex]

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7. The table shows the linear relationship between the total amount Mrs. Jacobs will be



charged for a skating party and the number of children attending.




Which equation best represents y, the total amount in dollars Mrs. Jacobs will be



charged for



x number of children attending the skating party?

Answers

Based on the information given in the table, we can see that there is a linear relationship between the total amount Mrs. Jacobs will be charged for a skating party and the number of children attending. This means that we can use a linear equation to represent this relationship.

To find the equation, we need to determine the slope (m) and y-intercept (b) of the line. We can do this by using two points from the table: (10, 100) and (20, 180).

The slope (m) can be calculated using the formula:

m = (y2 - y1) / (x2 - x1)

Plugging in the values, we get:

m = (180 - 100) / (20 - 10) = 8

The y-intercept (b) can be found by plugging in one of the points and the slope into the equation:

y = mx + b

Using the point (10, 100) and the slope we just calculated, we get:

100 = 8(10) + b

Solving for b, we get:

b = 20

Therefore, the equation that best represents y, the total amount in dollars Mrs. Jacobs will be charged for x number of children attending the skating party, is:

y = 8x + 20

This equation shows that for every additional child that attends the skating party, Mrs. Jacobs will be charged an additional $8, and the initial cost of the party is $20.

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What is the average rate if change over the domain -1

Answers

I'm sorry, but the domain of a function is usually specified as an interval or range of values, rather than a single point. To calculate the average rate of change of a function over a given domain, we need to know the function itself and the endpoints of the domain.

If you provide me with more details about the function and the domain, I can help you calculate the average rate of change.

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f(x)=(2−x)(x+4)^2(A) Find all critical values of f. If there are no critical values,enter -1000. If there are more than one, enter them separated bycommas.Critical value(s) = ______________(B

Answers

The critical values are x = -4 and x = 2.

Given the function f(x) = (2-x)(x+4)^2, we need to find the critical values.

Critical values are the points where the derivative of the function is either zero or undefined.

Step 1: Find the derivative of f(x). f'(x) = d/dx((2-x)(x+4)^2)

Step 2: Apply the product rule, which states d(uv) = u*dv + v*du,

where u = (2-x) and v = (x+4)^2. f'(x) = (2-x)*d/dx((x+4)^2) + (x+4)^2*d/dx(2-x)

Step 3: Compute the individual derivatives. f'(x) = (2-x)*(2(x+4)) + (x+4)^2*(-1)

Step 4: Simplify the expression. f'(x) = -2(x+4)^2 + 4(x+4)(2-x)

Step 5: Set f'(x) equal to 0 and solve for x. 0 = -2(x+4)^2 + 4(x+4)(2-x)

Step 6: Factor out a common term. 0 = 2(x+4)[-1(x+4) + 2(2-x)]

Step 7: Solve for x. 0 = 2(x+4)(-x+2) x = -4, 2 The critical values are x = -4 and x = 2.

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Select ALL the correct answers. Richard is renting a bike. The cost of renting a bike for the first hour is $7. He is charged $2.50 for every additional hour of renting the bike. Select all the functions that can be used to find the total amount that Richard is charged, f(n), for renting the bike for n hours. f ⁡ ( n ) = 2.5 ⁢ n + 7 f ⁡ ( n ) = 2.5 ⁢ n + 4.5 f ⁡ ( 1 ) = 7 ; f ⁡ ( n ) = f ⁡ ( n − 1 ) + 2.5 , for n ≥ 2 f ⁡ ( n ) = 4.5 ⁢ n + 2.5 f ⁡ ( 1 ) = 2.5 ; f ⁡ ( n ) = f ⁡ ( n − 1 ) + 7 , for n ≥ 2

Answers

The function that can be used to find the total amount is f(n) = 7 + (n - 1) * 2.5

Selecting the functions that can be used to find the total amount

From the question, we have the following parameters that can be used in our computation:

The cost of renting a bike for the first hour is $7. He is charged $2.50 for every additional hour of renting the bike.

This means that

f(n) = First hour + (n - 1) * Additional hour

Substitute the known values in the above equation, so, we have the following representation

f(n) = 7 + (n - 1) * 2.5

Hence, the function that can be used to find the total amount is f(n) = 7 + (n - 1) * 2.5

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You want to make a banner that says WELCOME HOME. You want the letters to be 2 feet high. You make a sketch in which the letters are 2 inches high. The entire phrase in your sketch is 20 inches long. What length of paper should you buy?

Answers

Answer:If the letters are 2 inches high in the sketch, and you want them to be 2 feet high in reality, that means you need to scale up the letters by a factor of 12 (since 1 foot = 12 inches).

So the new height of each letter will be:

2 inches/letter × 12 = 24 inches/letter

And the new length of the banner will be:

20 inches/banner × 12 = 240 inches/banner

To find out how much paper to buy, you need to know the width of the paper you'll be using. Let's say the paper is 36 inches wide (3 feet). In that case, you'll need to buy:

240 inches/banner ÷ 36 inches/roll = 6.67 rolls of paper

Since you can't buy a fraction of a roll of paper, you should round up to 7 rolls of paper to ensure you have enough.

Step-by-step explanation:

Find the particular solution for: 1 f"(x) = 0.25 x 7, = f'(4) = = and f(0) = 2. 8

Answers

Particular solution is: f(x) = (0.25/24) x⁹ - 6553.3333 x + 2

How to find the particular solution for the given differential equation?

We need to integrate it twice. Integrating once gives us:

f'(x) = (0.25/3) x⁸ + C1

where C1 is the constant of integration. Using the initial condition f'(4) = 8, we can solve for C1:

8 = (0.25/3) 4⁸ + C1
C1 = 8 - (0.25/3) 4⁸
C1 = -6553.3333

Integrating again gives us:

f(x) = (0.25/24) x⁹ + C1 x + C2

where C2 is another constant of integration. Using the initial condition f(0) = 2, we can solve for C2:

2 = (0.25/24) 0⁹ + C1 0 + C2
C2 = 2

So the particular solution is:

f(x) = (0.25/24) x⁹ - 6553.3333 x + 2

Note that we did not need to use the second initial condition, f'(4) = 8, to find the particular solution. This is because it was already used to find the constant of integration C1.

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Savannah recorded the average rainfall amount, in inches, for two cities over the course of 6 months. Show your work

City A: {2.5, 3, 6, 1.5, 4, 1}

City B: {4, 7, 3.5, 4, 3.5, 2}

What is the mean monthly rainfall amount for each city?

What is the mean absolute deviation (MAD) for each city? Round to the nearest tenth.

What is the median for each city?

Answers

Hello, I am Alyssa Ann Verrett.

Put the numbers in order:

City A: {2, 3.5, 4, 4, 5, 5.5}

City B: {3.5, 4, 5, 5.5, 6, 6}

a)

The mean monthly rainfall amount for city A: 4 in;

The mean monthly rainfall amount for city B: 5 in;

b)

The MAD monthly rainfall amount for city A: 0.8 in;

The MAD monthly rainfall amount for city B: 0.8 in;

c)

The median monthly rainfall amount for city A: 4 in;

The median monthly rainfall amount for city A: 5.25 in;

Step-by-step explanation:

a) The general definition of mean of a set X is:

mean = (x₁ + x₂ + x₃ + ... xₙ)/n

For City a:

mean = (4+3.5+5+5.5+4+2)/6 = 4

For City b:

mean = (5+6+3.5+5.5+4+6)/6 = 5

b) The general definition of mean absolute deviation of a set X is:

MAD = (|x₁-mean| + |x₂-mean| + |x₃-mean| + ... + |xₙ-mean|)/n

For City a:

MAD = ( |4-4| + |3.5-4| + |5-4| + |5.5-4| + |4-4| + |2-4| )/6 = (0 + 0.5 + 1 + 1.5 + 0 + 2)/6 = 5/6 =0.8

For City b:

MAD = ( |5-5| + |6-5| + |3.5-5| + |5.5-5| + |4-5| + |6-5| )/6 = (0 + 1 + 1.5 + 0.5 + 1 + 1)/6 = 5/6 = 0.8

c) The general definition of median depends on the quantity of elements in the set X and it represents the middlemost value of the set:

When the quantity is odd:

median= x₍ₙ₊₁₎/₂

When the quantity is even:

median= (xₙ/₂ + x ₙ₊₂/₂) /2

For City A:

median = 2, 3.5, 4, 4, 5, 5.5 = (4 + 4) / 2 = 4

For City B:

median = 3.5, 4, 5, 5.5, 6, 6 = (5 + 5.5) / 2 = 5.25

Solve for q q : 30 + q = 43 30+q=43

Answers

The solution to the equation 30 + q = 43 is q = 13.

What is the value of q?

Given the equation in the question:

30 + q = 43

To determine the value of q in the equation 30 + q = 43, isolate q on one side of the equation by performing the same operation on both sides of the equation.

30 + q = 43

q + 30 = 43

Next, we can isolate q by subtracting 30 from both sides of the equation:

q + 30 - 30 = 43 - 30

q = 43 - 30

Subtract 30 from 43

q = 13

Therefore, the value of q is 13.

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Mayumi was asked to determine whether quadrilateral rstu is a trapezoid given the vertices r(-2, 3), s(1, 4), t(1, -4) and u(-2, 1). she noticed that the slopes of ru and st are undefined, so she concluded that the quadrilateral could not be a trapezoid. do you agree? explain.

Answers

No, I do not agree with Mayumi's conclusion that the quadrilateral RSTU cannot be a trapezoid just because the slopes of RU and ST are undefined.

RSTU is a trapezoid with  RU and ST are parallel and have the same x-coordinates.

A trapezoid is defined as a quadrilateral with at least one pair of parallel sides.

The fact that the slopes of RU and ST are undefined does not necessarily mean that they are not parallel.

As vertical lines have undefined slopes and are parallel to each other.

To determine if RSTU is a trapezoid,

Mayumi should check if any pair of opposite sides are parallel.

The slopes of the two pairs of opposite sides RS and TU, and RU and ST and check if they are equal.

Slope of RS = (4 - 3)/(1 - (-2))

                    = 1/3

Slope of TU = (1 - (-4))/(-2 - 1)

                    = -5/3

Slope of RU is undefined (vertical line)

Slope of ST is undefined (vertical line)

Since the slopes of RS and TU are not equal, they are not parallel.

The slopes of RU and ST are undefined does not give us any information about their parallelism.

Check at other properties of the quadrilateral to determine if they are parallel.

One property is the coordinates of the points.

If we draw the quadrilateral,  RS and TU are not parallel, but RU and ST are parallel and have the same x-coordinates.

Therefore, quadrilateral RSTU is a trapezoid with bases RS and TU, and legs RU and ST.

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Find an equation of the circle drawn below.

Answers

Answer: x² + y²=6.25²

Step-by-step explanation:

Formula for a circle:

(x-h)²+(y-k)²=r²

where (h, k) is the center    yours: (0,0)

r is the raidus                                 r=6.25

Plug in:

x² + y²=6.25²

The relative growth rate of a biomass at time t, R, is related to the concentration of a
substrate s at time t by the equation.
R(s) = cs / k+s
where c and k are positive constants.
What is the relative growth rate of the biomass if there is no substrate present?

Answers

If there is no substrate present, the concentration of s would be 0.  The relative growth rate of biomass at time t, R, is related to the concentration of a substrate s at time t by the equation R(s) = cs / (k+s), where c and k are positive constants.

To find the relative growth rate of the biomass if there is no substrate present, we need to set the concentration of the substrate, s, to 0. Using the given equation, we can substitute 0 for s:

R(0) = c(0) / k + 0

R(0) = 0 / k

R(0) = 0

Therefore, the relative growth rate of the biomass would be 0 if there is no substrate present.
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HELP PLEASE, DUE IN 17 MINUTES!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
A bag of paper clips contains:
. 9 pink paper clips
• 7 yellow paper clips
• 5 green paper clips
• 4 blue paper clips
A random paper clip is drawn from the bag and replaced 50 times. What is a
reasonable prediction for the number of times a yellow paper clip will be
drawn?

A. 5
B. 8
C. 10
D. 12

Answers

I’m sure the answer will be 8
The answer issss B. 8

Greg uses a triangular area of his backyard as a garden. If the area of his backyard is 1,248 square feet, what is the area of the garden?

Answers

Unfortunately, we don't have enough information to determine the area of the garden. We would need to know the dimensions of the backyard and/or the garden to calculate their areas.

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The points (1,5), (5,10), (7,8), and (8,1) are on the graph of the function p. Which expression belo gives the average rate of change of the function p on 5 less than or equal x less than or equal 8

Answers

Answer:

Step-by-step explanation:

Since it is x that is bound by 5≤x≤8, you should use the points (5,10) and (8,1), since a coordinate is written as (x,y).

Then, use the formula for slope, as the average rate of change means find the slope, [tex]\frac{y2-y1}{x2-x1}[/tex]

thus, plug in

[tex]\frac{1-10}{8-5}[/tex], and you get -9/3, or -3. :)

let s be a finite minimal spanning set of a vector space v. that is, s has the property that if a vector is removed from s, then the new set will no longer span v.

Answers

A finite minimal spanning set of a vector space V is a set S that satisfies the following properties:

S is a spanning set of V, i.e., every vector in V can be expressed as a linear combination of vectors in S.S is finite, i.e., it contains a finite number of vectors.S is minimal, i.e., no vector can be removed from S without destroying the spanning property.

In other words, S is the smallest set of vectors that can be used to generate V. If we remove any vector from S, the resulting set will not be able to generate V anymore.

The concept of a finite minimal spanning set is important in linear algebra, particularly in the context of basis and dimension. A basis is a linearly independent spanning set of a vector space V.

A finite minimal spanning set is also a basis of V. The dimension of a vector space is the number of vectors in any basis of V. Since a finite minimal spanning set is a basis, the dimension of V is equal to the number of vectors in S.

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Full Question: Let S be a finite minimal spanning set of a vector space V. That is, S has the property that if a vector is removed from S, then the new set will no longer span V. Prove that S must be a basis for V.

The figure below is not drawn to scale. The height of the triangle ABC is 2 cm shorter than its base. Find the area of the shaded portions

Answers

The area of the shaded portion in the given triangle of the attached diagram with given measurements is equal to 30 square centimeters.

In triangle ABC ,

Base 'AB' = 3+ 6 + 3

                = 12cm

In the attached figure.

Let the perpendicular line passing through C intersect on AB at point D.

Height of the triangle ABC  'CD' = 12 -2

                                                     = 10 cm

Area of triangle ABC = ( 1/2) × AB × CD

                                   = ( 1/ 2) × 12 × 10

                                   = 60 cm²

Area of triangle excluding shaded portion = ( 1/2 ) × 6 × 10

                                                                       = 30cm²

Area of the shaded portion

= Area of triangle ABC - Area of triangle excluding shaded portion

= 60 - 30

= 30 square centimeters.

Therefore, the area of the shaded portion of the triangle in the attached figure is equal to 30 square centimeters.

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The above question is incomplete, the complete question is:

The figure below is not drawn to scale. The height of the triangle ABC is 2 cm shorter than its base. Find the area of the shaded portions.

Attached figure.

It takes Fena Tailoring 3 hr of cutting and 6 hr of sewing to make a tiered silk organza bridal dress. It takes 6 hr of cutting and 3 hr of sewing to make a lace sheath bridal dress. The shop has at most 30 hr per week available for cutting and at most 33 hr per week for sewing. The profit is ?$330 on an organza dress and ?$190 on a lace dress. How many of each kind of bridal dress should be made each week in order to maximize? profit? What is the maximum? profit?

Answers

Answer :The maximum profit is $1,650 when making 5 organza dresses and no lace dresses per week.

Explanation:

Let x represent the number of organza dresses, and y represent the number of lace dresses.

The time constraint for cutting:
3x + 6y ≤ 30

The time constraint for sewing:
6x + 3y ≤ 33

The profit function to maximize is:
P(x, y) = 330x + 190y

Using these constraints,
3x + 6y ≤ 30
6x + 3y ≤ 33
x ≥ 0
y ≥ 0

Optimal solution:

The corner points of the feasible region are (0,0), (0,5), (3,3), and (5,0). Calculate the profit for each point:

P(0,0) = 0
P(0,5) = 950
P(3,3) = 1,320
P(5,0) = 1,650

The maximum profit is $1,650 when making 5 organza dresses and no lace dresses per week.

A gardening club records the number of new plants each member planted in a

month. Create a histogram to show the data distribution for the number of new

plants. Show your work.

2

6

8

10

New Plants This Month
.

12
.

14

16

Answers

A histogram of the data distribution for the number of new plants is shown in the image below.

How to create a histogram to show the data distribution?

In this scenario and exercise, you are required to create a histogram to show the data distribution with respect to the number of new plants. First of all, we would determine the midpoint, absolute frequency, relative frequency, and cumulative frequency;

Midpoint                                      Absolute frequency      Rel. frequency

[0, 2] = (0 + 2)/2 = 1                        3 + 2 = 5                        0.128205

[2, 4] = (2 + 4)/2 = 3                        2 + 3 = 5                        0.128205

[4, 6] = (4 + 6)/2 = 5                        2 + 3 = 5                        0.128205

[6, 8] = (6 + 8)/2 = 7                                    2                        0.051282

[8, 10] = (8 + 10)/2 = 9                     3 + 4 = 7                        0.179487

[10, 12] = (10 + 12)/2 = 11                  4 + 3 = 7                        0.179487

[12, 14] = (12 + 14)/2 = 13                  1 + 2 = 3                        0.076923

[14, 16] = (14 + 16)/2 = 15                  3 + 2 = 5                        0.128205

Mathematically, the relative frequency of a data set can be calculated by using this formula:

Relative frequency = absolute frequency/total frequency × 100

Relative frequency = 5/39 × 100 = 0.128205

For the cumulative frequency, we have:

0.128205

0.128205 + 0.128205 = 0.25641

0.25641 + 0.128205 = 0.384615

0.384615 + 0.051282 = 0.435897

0.435897 + 0.179487 = 0.615385

0.615385 + 0.179487 = 0.794872

0.794872 + 0.076923 = 0.871795

0.871795 + 0.128205 = 1

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Missing information:

The question is incomplete and the complete question is shown in the attached picture.

Five years ago, a county lottery official conducted a very extensive (and expensive) study to determine the average age of lottery players in the county. From the data, he estimated the true age to be about 50 years. Five years later, the lottery official wants to know if the average age is now different from 50 years. He plans to conduct a smaller (and less expensive) survey of lottery players. From a random sample of 81 players from the county, the average age is 48. 7 years with a standard deviation of 8. 5 years.


(a) is there convincing evidence at the a = 0. 05 significance level that the present-day average age of all lottery players in the county is different from 50 years.


(b) Referring to your conclusion in part fa), what type of error may have been made? Describe the error in the context of this study

Answers

a. There is insufficient evidence to conclude that the average age of all lottery players in the county is different from 50 years at the 5% significance level.

b. Referring to the conclusion in part (a), the type of error that may have been made is a type II error, where we fail to reject a false null hypothesis.

(a) To test if the present-day average age of all lottery players in the county is different from 50 years, we can use a one-sample t-test with the null hypothesis:

H0: μ = 50

And the alternative hypothesis:

Ha: μ ≠ 50

Where μ is the population mean age of lottery players.

We have a sample size of n = 81, sample mean x = 48.7, and sample standard deviation s = 8.5. We can calculate the t-statistic as:

t = (x - μ) / (s / √n) = (48.7 - 50) / (8.5 / √81) = -1.29

Using a t-distribution table with 80 degrees of freedom (df = n - 1), we find the critical values to be ±1.990 at a significance level of α = 0.05 (two-tailed test).

Since the calculated t-statistic (-1.29) does not fall outside the critical values, we fail to reject the null hypothesis. There is insufficient evidence to conclude that the average age of all lottery players in the county is different from 50 years at the 5% significance level.

(b) Referring to the conclusion in part (a), the type of error that may have been made is a type II error, where we fail to reject a false null hypothesis. In other words, there may not be enough evidence to conclude that the population mean age is different from 50 years, even if it truly is.

The error in this context means that the lottery official may have missed an opportunity to update their estimate of the average age of all lottery players in the county.

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The area of a triangle is (27 + 13sqrt(2)) square feet. if the length of the base is (6 + sqrt(2)) feet, find the height of the triangle in simplest radical form.

Answers

If The area of a triangle is (27 + 13sqrt(2)) square feet. if the length of the base is (6 + sqrt(2)) feet, then the triangle's height is (27 - 13sqrt(2)) / 17 feet.

We are given the area A and the length of the base b. We can use this information to solve for the height h as follows:

A = (1/2)bh

2A = bh

h = (2A)/b

Substituting the given values, we get:

h = (2(27 + 13sqrt(2))) / (6 + sqrt(2))

We can simplify this expression by rationalizing the denominator as follows:

h = [(2(27 + 13sqrt(2))) / (6 + sqrt(2))] * [(6 - sqrt(2))/(6 - sqrt(2))]

h = [(54 - 26sqrt(2)) / (34)]

h = (27 - 13sqrt(2)) / 17

Therefore, the triangle's height is (27 - 13sqrt(2)) / 17 feet.

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Find ln 0. 732 to four decimal places



A.


-0. 5227


B.


-0. 3120


C.


-0. 4624


D.


-0. 4719

Answers

Using a calculator, we can evaluate ln 0.732 to four decimal places. The correct answer is option D, -0.4719.

The natural logarithm of a number is the logarithm to the base e (approximately 2.71828), and ln 0.732 is the natural logarithm of the number 0.732.

To find the value of ln 0.732, we simply input the number into the calculator and hit the ln key.

The result is approximately -0.4719, rounded to four decimal places. Therefore, the correct answer is D, -0.4719.

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Reina’s greenhouse is shaped like a square pyramid with four congruent equilateral triangles for its sides. All of the edges are 6 feet long. What is the total surface area of the greenhouse including the floor? Round your answer to the nearest hundredth.

____ft2

Answers

With all of the edges 6 feet long, the total surface area of the greenhouse including the floor is approximately 98.39 ft².

To find the total surface area of Reina's greenhouse, we'll need to calculate the area of the equilateral triangular sides and the square base.

1. Equilateral triangular sides:
There are four congruent equilateral triangles with edges of 6 feet each. To find the area of one triangle, we can use the formula A = (s² * √3) / 4, where A is the area and s is the side length.

A = (6² * √3) / 4 = (36 * √3) / 4 = 9√3 square feet

Since there are four triangles, the total area of the triangular sides is 4 * 9√3 = 36√3 square feet.

2. Square base:
The base is a square with side lengths of 6 feet. To find the area, we can use the formula A = s².

A = 6² = 36 square feet

Now, let's add the area of the triangular sides and the square base

Total surface area = 36√3 + 36 ≈ 98.39 ft² (rounded to the nearest hundredth)

So, the total surface area of the greenhouse including the floor is approximately 98.39 ft².

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Can someone PLEASE help me ASAP? It’s due today!! I will give brainliest if it’s done and correct.

Answers

The number of different sandwiches that can be created with two different meats is D. 6.

How to find the number of sandwiches ?

The number of different sandwiches that can be created with two different meats can be found by using the combination formula: nCr = n! / r!(n-r)!

In this case, we have 4 options for the first meat and 3 options for the second meat (since we cannot repeat the first meat). Therefore, the number of different sandwiches is:

4C2 = 4! / 2!(4-2)! = 6

So there are 6 different sandwiches that can be created with two different meats.

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4 (23) A doll maker's profit function is given by P(x) = (x-4).* - 4 (4 pts) where OCX5 3.9 find the following: (a) The critical number(s) (if any) [ Hint: Simplify the function BEFORE you take the derivative of the function] (b) The production levels in interval notation where the function is decreasing. (4pts)

Answers

The profit function P(x) is given as P(x) = (x-4)^2 - 4. To find critical numbers, the derivative of P(x) is calculated and set to zero. The intervals where the function is decreasing are determined by analyzing the sign of P'(x) on the intervals determined by the critical number(s).

Let's address each part step by step:

(a) First, let's simplify the profit function, P(x), which is given by P(x) = (x - 4)^2 - 4. To find the critical numbers, we need to find the derivative of the profit function with respect to x and set it to zero.

P'(x) = d/dx [(x - 4)^2 - 4]
P'(x) = 2(x - 4)

Now, set P'(x) to zero and solve for x:
2(x - 4) = 0
x - 4 = 0
x = 4

So, there is one critical number, x = 4.

(b) To determine the intervals where the function is decreasing, we need to analyze the sign of P'(x) on the intervals determined by the critical number(s).

For x < 4, P'(x) = 2(x - 4) < 0, which means the function is decreasing.
For x > 4, P'(x) = 2(x - 4) > 0, which means the function is increasing.

In interval notation, the function is decreasing on the interval (-∞, 4). Keep in mind that the original function has a domain restriction of 0 ≤ x ≤ 5, so considering that, the production levels where the profit function is decreasing are on the interval (0, 4).

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