The probability that the other child is a boy given that the shorter child is a boy is approximately 0.56 or 56%.
The problem can be solved using Bayes' theorem, which states that:
P(A|B) = P(B|A) * P(A) / P(B)
where A and B are events, P(A|B) is the conditional probability of event A given event B has occurred, P(B|A) is the conditional probability of event B given event A has occurred, P(A) is the prior probability of event A, and P(B) is the prior probability of event B.
Let A be the event that both children are boys, and B be the event that the shorter child is a boy. We are given that P(B|A') = 1/2, since the gender of the taller child is equally likely to be a boy or a girl.
We are also given that P(A') = 3/4, since there are three equally likely possibilities for the gender of the two children: boy-girl, girl-boy, and girl-girl. Finally, we are given that in 89% of families consisting of one son and one daughter the son is taller than the daughter, which means that P(B|A) = 0.89.
Using Bayes' theorem, we can calculate the probability that the other child is a boy given that the shorter child is a boy:
P(A|B) = P(B|A) * P(A) / P(B)
= 0.89 * (1/4) / [(1/2) * (3/4) + 0.89 * (1/4)]
≈ 0.56
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What are the coordinates of A9-5,2) after the following series of transformations?
a reflection across the x-axis followed by a translation of the rule (x-3, y+4)
Group of answer choices
(-8,6)
(8,6)
(-8,-6)
(8,-6)
The coordinates of the image point A" after the given series of transformations are (6,9,2), which corresponds to answer choice (b) (8,6).
What is series of transformations?A series of transformations is a sequence of two or more geometric transformations applied one after the other to a given figure or object, to produce a new transformed figure or object.
Each transformation in the sequence modifies the position, shape, or orientation of the figure or object in some way.
To find the image of point A(9,-5,2) after the given series of transformations, we can apply them one by one.
Reflection across the x-axis:
1. The reflection of point across the x-axis is obtained by changing the sign of its y-coordinate while keeping the x and z coordinates the same. Therefore, the image of A after reflection across the x-axis is A'(9,5,2).
2. Translation by the rule (x-3, y+4):
This transformation moves the point A' 3 units to the left and 4 units up. Therefore, the coordinates of the image point A" are obtained by subtracting 3 from the x-coordinate and adding 4 to the y-coordinate of A', i.e.,
A" = (9-3, 5+4, 2) = (6,9,2)
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help, how would i solve this if x = 6
x = 6 is a valid solution to the equation 3x + 5 = 23.
However, we can give you some general tips on how to approach a math problem when given a specific value of a variable like x = 6:1. Identify the equation or problem that involves x.2.
Replace every instance of x in the equation with the given value, which in this case is 6.3.
Simplify the equation by performing any necessary operations (addition, subtraction, multiplication, division, etc.)4. Solve for the unknown value if possible.
For example, if the equation is 3x + 5 = 23 and x = 6, we would replace every instance of x with 6:
3(6) + 5 = 23
Simplify by multiplying 3 and 6 and adding 5:
18 + 5 = 23
Simplify further by adding 18 and 5: 23 = 23.
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there are 3 cards with a picture of a rose and 1 card with a picture of a daisy. melody keeps all the cards face down on a table with the pictures hidden and mixes them up. she then turns over one card face up and finds the picture of a rose on it. she removes this card from the table and turns over another card without looking. what is the probability that the card that melody turns over has a rose on it?
The probability that the card that melody turns over has a rose on it = 2/3
Here, 3 cards with a picture of a rose and 1 card with a picture of a daisy.
So, the total number of cards : 3 + 1 = 4
First Melody turns over one card face up and finds the picture of a rose on it.
Now there are 3 cards( two rose cards and a card with a picture of a daisy) on a table.
Let us assume that event A: the card that melody turns over (second time) has a rose on it
here, the number of rose cards n(A) = 2
And the number of remaining cards n(S) = 3
Using the definition of probability, the probability of this event would be,
P(A) = n(A)/n(S)
P(A) = 2/3
Therefore, the required probability is 2/3
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How do you turn 3y+3x=2y-2 into a y=mx+b equation?
Accοrding tο the given infοrmatiοn, the equatiοn y = -3x - 2 represents the same line as the equatiοn 3y+3x=2y-2.
What is an equatiοn?An equatiοn is a mathematical assertiοn that prοves the equality οf twο expressiοns. The equals sign (=) separates the twο sides, which make up the οbject. The expressiοns in the equatiοn's twο sides may include numerical values, variables, and mathematical οperatiοns like additiοn, subtractiοn, multiplicatiοn, and divisiοn.
Tο turn the equatiοn 3y+3x=2y-2 intο the y=mx+b fοrm, yοu need tο isοlate y οn οne side οf the equatiοn.
First, simplify the left-hand side οf the equatiοn by cοmbining the like terms οf 3y and 3x:
3y + 3x = 2y - 2
3y - 2y = -3x - 2
y = -3x/1 - 2/1
Nοw, the equatiοn is in the y=mx+b fοrm, where m is the slοpe and b is the y-intercept. In this case, the slοpe m is -3 and the y-intercept b is -2.
Therefοre, the equatiοn y = -3x - 2 represents the same line as the equatiοn 3y+3x=2y-2.
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volume of a cylinder geometry problems
Answer:
81
Step-by-step explanation:
For 1 rod:
V = πr²h
V = 3.14 × (3 cm)² × 20 cm
V = 565.2 cm³
Total volume of steel used: 45,781.2 cm³
45,781.2 cm³ / 565.2 cm³ = 81
Answer: 81
Order the steps to solve the equationlog(x2 - 15) = log(2x) form 1 to 5.x2 - 2x - 15 = 0Potential solutions are -3 and 510.00x2 - 15 = 2xX-5 = 0 or x +3=0(x - 5)(x + 3) = 0
To solve the equation \begin{equation}-\log{\left(x^2 - 15\right)} = \log{\left(2x\right)}\end{equation}, the following steps can be taken:
Apply the logarithmic identity log(a) = log(b) if and only if a = b to obtain the equation x^2 - 15 = 2x.
Move all the terms to one side of the equation to get x^2 - 2x - 15 = 0.
Factor the quadratic expression to obtain (x - 5)(x + 3) = 0.
Use the zero product property, which states that if the product of two factors is zero, then at least one of the factors must be zero, to get x - 5 = 0 or x + 3 = 0.
Solve for x in each equation to obtain x = 5 or x = -3.
Therefore, the steps to solve the equation log(x^2 - 15) = log(2x) from 1 to 5 are:
Apply the logarithmic identity to get x^2 - 15 = 2x.
Move all the terms to one side of the equation to get x^2 - 2x - 15 = 0.
Factor the quadratic expression to obtain (x - 5)(x + 3) = 0.
Use the zero product property to get x - 5 = 0 or x + 3 = 0.
Solve for x in each equation to obtain x = 5 or x = -3.
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Question 3(Multiple Choice Worth 2 points)
(Comparing Data MC)
The box plots display measures from data collected when 20 people were asked about their wait time at a drive-thru restaurant window.
A horizontal line starting at 0, with tick marks every one-half unit up to 32. The line is labeled Wait Time In Minutes. The box extends from 8.5 to 15.5 on the number line. A line in the box is at 12. The lines outside the box end at 3 and 27. The graph is titled Super Fast Food.
A horizontal line starting at 0, with tick marks every one-half unit up to 32. The line is labeled Wait Time In Minutes. The box extends from 9.5 to 24 on the number line. A line in the box is at 15.5. The lines outside the box end at 2 and 30. The graph is titled Burger Quick.
Which drive-thru is able to estimate their wait time more consistently and why?
Burger Quick, because it has a smaller IQR
Burger Quick, because it has a smaller range
Super Fast Food, because it has a smaller IQR
Super Fast Food, because it has a smaller range
Burger Quick's box plot has a larger IQR than Super Fast Food's, hence Super Fast Food is better able to predict their wait time
Define IQR?
A measurement of statistical dispersion, or the spread of the data, is the interquartile range (IQR). It is described as the variation between the data's 75th and 25th percentiles. The fourth spread, middle 50%, midspread, or H-spread1 are further names for the IQR.
The dataset is displayed using a box plot, which is a standardized method based on the five-number summary of the minimum, maximum, sample median, and first and third quartiles
The box plot displays measurements made from data acquired from interviews with 20 people on how long they waited at a drive-through restaurant window.
Burger Quick's box plot has a larger IQR than Super Fast Food's, hence Super Fast Food is better able to predict their wait time.
A data set is divided into quartiles to calculate the IQR (Interquartile Range), which is a measure of variability. The first quartile (Q1) is subtracted from the third quartile (Q3) to determine it.
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the student breaks taken during a class session are normally distributed with a mean of 6.3 minutes and a standard deviation of 2.2 minutes. find the probability that a student break lasts more than 7 minutes.
To find the probability that a student break lasts more than 7 minutes, we can use the z-score formula to standardize the break time and then use the standard normal distribution table or a calculator to find the probability. The probability that a student break lasts more than 7 minutes is approximately 0.3745 or 37.45%.
Step 1: Calculate the z-score.
The z-score formula is given by:
z = (X - μ) / σ
where X is the break time, μ is the mean, and σ is the standard deviation. In this case, X = 7 minutes, μ = 6.3 minutes,
and σ = 2.2 minutes. Plugging in these values:
z = (7 - 6.3) / 2.2 ≈ 0.32
Step 2: Find the probability using the standard normal distribution table or a calculator.
Now that we have the z-score, we can find the probability that a student break lasts more than 7 minutes. We want to find the area to the right of the z-score (0.32) since we are interested in break times longer than 7 minutes.
Using a standard normal distribution table or a calculator, we find that the area to the left of z = 0.32 is approximately 0.6255. However, we want the area to the right of z = 0.32, which is given by:
Area to the right of z = 1 - Area to the left of z
Area to the right of z ≈ 1 - 0.6255 ≈ 0.3745.
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HELP ME PLEASE! I NEED TO KNOW WHAT FUNCTION THAT IS!
The equation representing the total number of pages read by Victor is: p = 9 + 2m.
Explain about the rate of change:An indicator of how some quantity changes in proportion to another is called a rate of change.
Positive or negative change rates are possible. This reflects a change in the mathematical model -value between the two points of information. Zero change rate refers to a quantity that does not fluctuate over time.
You can determine the amount of change that has occurred over this time period if you have data at two points in time. The outcome is known as the rate of change, sometimes known as the percentage change, and is represented by a percentage (in absolute numbers, it really is merely a difference).
Given data:
Initial number of pages read = 9per minute pages read by Victor = 2Let 'm' be the total number of minute.
Let 'p' be the total number of pages read after 'm' minutes.
p = 9 + 2m
Thus, the equation representing the total number of pages read by Victor is: p = 9 + 2m.
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true or false? in the context of our theory of inductive proofs, p(n) represents the quantity about which we are proving something.
In the context of our theory of inductive proofs, P(n) represents the quantity about which we are proving something- False.
A proof by induction requires justification at every step, just like a regular proof. But, it uses a clever technique that enables you to demonstrate the truth of a proposition when n is 1, assume it is true for n=k, and then demonstrate that it is true for n=k+1.
According to the theory, all that is required to demonstrate a person's ability to ascend to the nth floor of a fire escape is for them to demonstrate their ability to ascend the fire escape ladder (n=1) and their ability to ascend the stairs from any level of the fire escape (n=k) to the next level (n=k+1).
You could have been asked to assume the n-1 case and prove the n case if you've done proof by induction before, or to assume the n case and show the n+1 case. This is the same as what I'm describing here, but I'll use a different letter since I believe it helps people understand what each instance is for better.
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Tom went to the cinema with his family.he bought 3 child tickets at £5.50 each and 2adult tickets for £8.50 each.
How much did he spend in total
The total amount spent by Tom in the cinema with his family is £33.50
The given question is based on the concept of arithmetic operations, where we have to find the total expenditure of Tom in the cinema with his family. According to the given information, he bought 3 child tickets at £5.50 each and 2 adult tickets for £8.50 each.
Therefore, the total cost spent by him would be calculated as follows:
Total cost of 3 child tickets = 3 × £5.50 = £16.50
Total cost of 2 adult tickets = 2 × £8.50 = £17
Total expenditure of Tom = £16.50 + £17 = £33.50
Therefore, the total amount spent by Tom in the cinema with his family is £33.50.
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Given that the square root of 225 is 15 and the square root of 256 is 16, which number is closest to the square root of 240?
Responses
15.1
15.1
15.5
15.5
15.8
15.8
15.9
15.9
We can approach this problem by first finding the two perfect squares that 240 lies between:
15^2 = 225 and 16^2 = 256.
Since the square root of 240 must lie between the square root of 225 and 256, we can choose the number that is closest between 15 and 16.
To do this, we can calculate the distance between the square root of 240 and each of the two numbers:
The distance between 15 and the square root of 240 is |15 - sqrt(240)| = 1.18
The distance between 16 and the square root of 240 is |16 - sqrt(240)| = 0.34
Therefore, 16 is closest to the square root of 240.
rick earns 8.50 per hour at his mothers office he plans on working 12.5 hours this week how much money wil rick earn
Answer:
106.25
Step-by-step explanation:
Answer: The answer is 106.25
Step-by-step explanation: I used a calculator and just multiplied them both.
1) What was the interest rate if Nick's balance on an investment of $74,460 at
the end of nine years was $97,153.41 and the interest was compounded
annually? Round your answer to the nearest tenth of a percent.
The interest rate of Nick's investment is 3% per year.
What was the interest rate of Nick's balance on the investment?We can use the formula for compound interest to solve for the interest rate r:
A = P(1 + r/n)^(nt)
r = n[ (A/P)^(1/nt) - 1 ]
Given that:
A = final amount = $97,153.41
P = principal amount = $74,460
n = number of times compounded annually = 1 (compounded annually)
t = time in years = 9
r = annual interest rate r = ?
Solving for rate r as a decimal
r = n[ (A/P)^(1/nt) - 1 ]
r = 1 × [ (97153.41/74640)^(1/1×9) - 1]
r = 0.0297237
Then convert r to R as a percentage
R = r × 100%
R = 0.0297237 × 100%
R = 3% per year.
Therefore, the interest rate is 3%.
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Which two expressions are
equivalent?
A 8 Divided by 3 and 3/8
B 4 divided by 1 and 1/4
C 6 divided by 7 and 6/7
D 9 divided by 2 and 2/9
Answer:
The two expressions that are equivalent are:
B) 4 divided by 1 and 1/4,
D) 9 divided by 2 and 4/9
Answer: i believe its c
Step-by-step explanation: a division symbol and a fractions bar can mean the same thing.
Use the drop-down menus to complete each equation so the statement about its solution is true.
No Solutions
5−4+7x+1=
x +
One Solution
5−4+7x+1=
x +
Infinitely Many Solutions
5−4+7x+1=
x +
No Solutions
5−4+7x+1 =
x + 2
One Solution
5−4+7x+1 =
x - 2
what are the solutions to -3x-3<6
Answer:=-3
Step-by-step explanation: trust the processe
-3x-3<6
+3 l+3
-3x > 9
-3x -3x
x=-3
Please what’s 7 divided by 70.85 please show work
Answer:
0.098
Step-by-step explanation:
Question 1
What is the approximate circumference of a plate with a diameter of 11 inches? Use 3.14 for . Round to the nearest
hundredth if necessary.
Answer:
34.54 in
Step-by-step explanation:
The approximate circumference of a plate with a diameter of 11 inches can be calculated using the formula C = πd, where C is the circumference and d is the diameter .
So, substituting the given value of diameter d = 11 inches and taking π to be approximately 3.14, we get:
C = πd = 3.14 x 11 = 34.54 inches (approx.)
Therefore, the approximate circumference of the plate is 34.54 inches.
Since it is required to round the answer to the nearest hundredth, we get the rounded answer as 34.54 rounded off to two decimal places, which is 34.54 (no rounding needed).
Answer: For circumference, you simply multiply the diameter by pi, so the answer you are looking for is 34.54
Step-by-step explanation:
you reach into the bag, pick out a coin at random, flip it and it comes up heads. what is the (conditional) probability that the coin you chose is fake?
The conditional probability that the coin chosen is fake given that it came up heads after flipping is not possible to determine without additional information.
The given information provides us with the result of a single trial, and it does not provide any information about the prior probability of choosing a fake coin from the bag. Therefore, the conditional probability of the coin being fake given that it came up heads depends on the prior probability of choosing a fake coin, which is not given.
If we assume that there is an equal chance of choosing a real or fake coin from the bag, then the probability that the coin is fake would be the ratio of the probability of choosing a fake coin to the probability of getting heads from either a real or a fake coin.
However, if we assume that the prior probability of choosing a fake coin is very low, then the probability of the coin being fake would also be very low, even if it came up heads. Therefore, without information about the prior probability of choosing a fake coin, we cannot determine the conditional probability that the coin is fake given that it came up heads.
Therefore, the given information is not sufficient to determine the conditional probability that the coin is fake
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PLEASE HELP
Use your knowledge of the customary system to circle all the quantities that are less than 16 cups.
A. 6 pints
B. 1 gallon
C. 5 quarts
D. 8 pints
E. 3 quarts
The quantities that are less than 16 cups are: 6 pints (A) and 3 quarts (E).
let's convert each option to cups:
A. 6 pints: There are 2 cups in a pint, so 6 pints × 2 cups/pint = 12 cups.
B. 1 gallon: There are 16 cups in a gallon, so 1 gallon = 16 cups.
C. 5 quarts: There are 4 cups in a quart, so 5 quarts × 4 cups/quart = 20 cups.
D. 8 pints: There are 2 cups in a pint, so 8 pints × 2 cups/pint = 16 cups.
E. 3 quarts: There are 4 cups in a quart, so 3 quarts × 4 cups/quart = 12 cups.
Now, let's see which options are less than 16 cups:
A. 6 pints: 12 cups (less than 16 cups)
B. 1 gallon: 16 cups (not less than 16 cups)
C. 5 quarts: 20 cups (not less than 16 cups)
D. 8 pints: 16 cups (not less than 16 cups)
E. 3 quarts: 12 cups (less than 16 cups)
So, the quantities that are less than 16 cups are: 6 pints (A) and 3 quarts (E).
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Combine the like terms to create an equivalent expression.
4n + 11 + 2n =
Answer:
To combine like terms, we add the coefficients of the variable n. Therefore, we can combine the two terms with n: 4n + 2n = 6n The expression becomes: 6n + 11
The number of bacteria in a test tube is increasing by 25% every hour.
f(1)=4.0 billion
f(n)=f(n−1)+0.25f(n−1)
What will be the value of f(3)?
A. 5.25 billion
B. 6.25 billion
C. 6.0 billion
D. 5.0 billion
The value of f(3) is 6.25 billion, which is option B.
What is Function ?
In mathematics, a function is a rule that associates each input value (also known as the independent variable) with a unique output value (also known as the dependent variable). It is a mathematical object that takes one or more input values and produces an output value.
The input values are usually taken from a set called the domain, and the output values are taken from a set called the range.
We can use the given formula to find the value of f(3) as follows:
f(2) = f(1) + 0.25f(1) = 4.0 billion + 0.25(4.0 billion) = 5.0 billion
f(3) = f(2) + 0.25f(2) = 5.0 billion + 0.25(5.0 billion) = 6.25 billion
Therefore, the value of f(3) is 6.25 billion, which is option B.
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Alg 1 task - 250 toothpicks pyramid
Write a function f(l) that determines the number of triangles in any given level of the pyramid.
ƒ(1) =
PLSS HELP ASAPPP
To determine the number of triangles in any given level of the pyramid, we can use the formula:
Number of triangles = (level)^2
Therefore, to find the number of triangles in the first level of the pyramid, we can substitute 1 for level in the formula:
ƒ(1) = (1)^2 = 1
So, there is only 1 triangle in the first level of the pyramid.
Answer:
1
Step-by-step explanation:
what is the probability that the risk level is 0 (0 for low risk, and 1 for high risk) irrespective of the applicant's marital status?
The probability that the risk level is 0 irrespective of the applicant's marital status is 0.6.
The given information states that 60% of loan applicants were classified as low risk (risk level 0), and 40% were classified as high risk (risk level 1). Therefore, the probability of an applicant being classified as low risk is 0.6, and the probability of being classified as high risk is 0.4.
The question asks for the probability that an applicant is classified as low risk regardless of their marital status. This means that the probability is not affected by whether the applicant is married or not.
Since we know that the probability of an applicant being classified as low risk is 0.6, and this probability is not affected by their marital status, the answer to the question is simply 0.6.
In other words, regardless of whether an applicant is married or not, there is a 60% chance that they will be classified as low risk.
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Complete question is:
In a study, 60% of loan applicants were classified as low risk (risk level 0), while 40% were classified as high risk (risk level 1). And 40%of loan applicants were classified as low risk and married and 30% of loan applicants were classified as high risk and married. What is the probability that an applicant is classified as low risk (risk level 0) regardless of their marital status?
why would you multiply in this problem?
jasper's lawn is 3/4 of an acre is size. the fertilizer bag states that 5 1/2 bags are required for 1 acre. how many bags does jasper need to fertilize his lawn.
the fertilizer bag states that 5 1/2 bags are required for 1 acre. then Jasper needs 33/8 bags of fertilizer to fertilize his lawn.
To solve this problem, you need to find out how many bags of fertilizer Jasper needs to fertilize his lawn, which is 3/4 of an acre in size.
To do this, you need to use the information given on the fertilizer bag, which states that 5[tex]\frac{1}{2}[/tex] bags are required for 1 acre of land.
You can then set up a proportion to find out how many bags Jasper needs. Since Jasper's lawn is 3/4 of an acre in size, you can set up the proportion as follows:
5 [tex]\frac{1}{2}[/tex] bags / 1 acre = x bags / 3/4 acre
To solve for x, you can cross-multiply and simplify:
5 1/2 bags * 3/4 acre = x bags * 1 acre
(11/2) * (3/4) = x
(33/8) = x
Therefore, Jasper needs 33/8 bags of fertilizer to fertilize his lawn. You would multiply in this problem to solve for the unknown variable, x, which represents the number of bags of fertilizer that Jasper needs.
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b. using the random table to obtain a systematic sample: 1. list the steps for using the random number table to obtain a systematic sample. 2. what would be the nth value?
1. To get a systematic sample with a random number table, divide the population size by the desired sample size to obtain the sampling interval, select a random starting point from the first n values where n is the sampling interval, and choose every nth value until the sample size is reached.
2. The nth value is found by dividing the population size by the desired sample size.
Determine the total number of items in the population (N) that you want to sample from. Decide on the desired sample size (n) that you want to obtain from the population.
Calculate the sampling interval (k) by dividing the population size by the desired sample size: k = N / n. Choose a random starting point between 1 and k.
Select every kth item in the population from the starting point until the desired sample size is reached. If the last selection exceeds the population size, start again from the beginning.
The nth value would be the sampling interval (k), which is calculated by dividing the population size by the desired sample size.
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a pollster wishes to estimate the true proportion of u.s. voters who oppose capital punishment. how many voters should be surveyed in order to be 95% confident that the true proportion is estimated to within 2%?
To be 95% confident that the true proportion of U.S. voters who oppose capital punishment is estimated to within 2%, the pollster should survey 2401 voters.
The pollster wants to estimate a proportion, so we will use the formula for sample size for proportions:
[tex]n=\frac{z^2 * p * (1 - p)}{(E^2}[/tex])
where:
n = sample size
z = the z-score associated with the desired confidence level (95% confidence level corresponds to z = 1.96)
p = an estimate of the true proportion (we don't know this yet, so we will use 0.5 as a conservative estimate that gives the largest sample size)
E = the desired margin of error (2% = 0.02)
Substituting the values into the formula, we get:
[tex]n = \frac{(1.96^2 * 0.5 * (1 - 0.5))} {(0.02^2} = 2401[/tex]
Therefore, the pollster should survey 2401 voters to be 95% confident that the true proportion of U.S. voters who oppose capital punishment is estimated to within 2%.
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Length ams breadth and height of rectangle block. Ratio is 4:3:5 and its volume is 3840 cm3 calculate length, breadth, height
The length, breadth, and height of the rectangular block are 256 cm, 192 cm, and 320 cm respectively.
To calculate the length, breadth, and height of a rectangular block whose ratio is 4:3:5 and its volume is 3840 cm3,
follow the steps below:
The ratio of length, breadth, and height is 4:3:5 respectively.
Therefore, assume the length to be 4x, the breadth to be 3x, and the height to be 5x, where x is the common factor.
Then, the volume of the block is calculated as:
Volume = length × breadth × height= 4x × 3x × 5x= 60x³
Since the volume of the block is 3840 cm³, we can equate the equation above to 3840 and solve for x, then find the
length, breadth, and height.
60x³ = 3840 x³ = 3840/60 x³ = 64
Length = 4x = 4 × 64 = 256 cm
Breadth = 3x = 3 × 64 = 192 cm
Height = 5x = 5 × 64 = 320 cm
Therefore, the length, breadth, and height of the rectangular block are 256 cm, 192 cm, and 320 cm respectively.
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5.the number of calls that come into a small mail-order company follows a poisson distribution. currently, these calls are serviced by a single operator. the manager knows from past experience that an additional operator will be needed if the rate of calls exceeds 20 per hour. the manager observes that 9 calls came into the mail-order company during a randomly selected 15-min. a. if the rate of calls is actually 20 per hour, what is the probability that 9 or more calls will come in during a given 15-minute period? b. if the rate of calls is really 30 per hour, what is the probability that 9 or more calls will come in during a given 15-minute period? c. based on the calculations in parts a and b, do you think that the rate of incoming calls is more likely to be 20 or 30 per hour? d. would you advise the manager to hire a second operator? explain.
The required probability for the given rate of calls per hour using Poisson distribution is ,
Probability of calls rate are 20 per hour is 0.734
Probability of calls rate are 30 per hour is 0.654..
Probability of 20 per hour is higher in comparison of 30 per hour.
Yes . Manager should consider second operator.
Actual rate of calls = 20 per hour,
Expected number of calls in a 15-minute period is,
= (20/60) × 15
= 5
The probability of getting 9 or more calls in a 15-minute period is,
P(X ≥ 9) = 1 - P(X ≤ 8)
Using the Poisson distribution with λ = 5, we have,
P(X ≤ 8)
= e^(-5) × (5^0/0!) + e^(-5) ×(5^1/1!) + ... + e^(-5) × (5^8/8!)
= 0.266
Probability of getting 9 or more calls in a 15-minute period is,
P(X ≥ 9)
= 1 - P(X ≤ 8)
= 1 - 0.266
= 0.734
If the rate of calls is really 30 per hour.
Expected number of calls in a 15-minute period is,
= (30/60) × 15
= 7.5
Probability of getting 9 or more calls in a 15-minute period is,
P(X ≥ 9) = 1 - P(X ≤ 8)
Using the Poisson distribution with λ = 7.5, we have,
P(X ≤ 8)
= e^(-7.5) * (7.5^0/0!) + e^(-7.5) * (7.5^1/1!) + ... + e^(-7.5) * (7.5^8/8!)
= 0.346
Probability of getting 9 or more calls in a 15-minute period is,
P(X ≥ 9)
= 1 - P(X ≤ 8)
= 1 - 0.346
= 0.654
Based on the calculations in parts a and b,
Probability of getting 9 or more calls in a 15-minute period is higher .
If the rate of incoming calls is 20 per hour (0.734) compared to if the rate is 30 per hour (0.654).
Based on the calculations,
Current operator can handle the call volume with a high probability if the call rate is 20 per hour.
However, if the call rate is 30 per hour, there is a relatively high probability of needing a second operator.
Manager should consider hiring a second operator if the rate of incoming calls is expected to be 30 per hour or higher.
Therefore, the probability of the given situation are,
For the rate of calls 20 per hour is 0.734.
For the rate of calls 30 per hour is 0.654.
Probability of 20 per hour is higher than 30 per hour.
Yes , manager should consider second operator is call rate are 30 per hour or higher.
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