Answer:
To determine whether a sampling is random or biased, we need to know how the sample was selected. Here are three possible scenarios:
Ranger 1 stands at the entrance to the park and surveys the first 100 visitors who arrive.
This sampling is biased, as it only includes visitors who arrived early in the day. Visitors who arrive later in the day may have different characteristics or behaviors, so this sample may not be representative of all park visitors.
Ranger 2 selects every 10th visitor who enters the park and surveys them.
This sampling is random, as every 10th visitor is selected without bias. This method is called systematic sampling.
Ranger 3 surveys visitors who are leaving the park on a rainy day.
This sampling is biased, as visitors who come to the park on a rainy day may have different motivations or behaviors than visitors on a sunny day. This sample may not be representative of all park visitors.
In summary, sampling methods that are random, such as systematic sampling, are preferred over biased sampling methods in order to obtain a representative sample of the population of interest.
Answer: Depending on the situation
Step-by-step explanation: For a sample to be random, everyone/thing has to have an equal chance of getting selected. Ex. One of the park rangers asked everyone in one part of the park. - This example would be biased because the people who weren't in that part of the park had less of a chance of being picked
Please help will give brainlest and special thanks
Answer:
30
Step-by-step explanation:
3x+ 10= 100
-10 -10
3x=90
divide both sides by 3 nd you get 30
ILL GIVE BRAINLIEST WORTH 69 POINTS
Use the graph to answer the question. Graph of polygon ABCD with vertices at 1 comma negative 1, 3 comma negative 5, 7 comma negative 5, 5 comma negative 1. A second polygon A prime B prime C prime D prime with vertices at 1 comma negative 6, 3 comma negative 10, 7 comma negative 10, 5 comma negative 6. Determine the translation used to create the image. 5 units down 5 units up 1 unit down 1 unit up
Answer:
The translation used to create the image from polygon ABCD to polygon A' B' C' D' is 5 units down.
Step-by-step explanation:
You can see this by observing that all of the y-coordinates in A' B' C' D' are 5 units less than their corresponding y-coordinates in ABCD. Specifically, the y-coordinates of the vertices in ABCD are (-1, -5, -5, -1), and the y-coordinates of the vertices in A' B' C' D' are (-6, -10, -10, -6).
Therefore, the vertical shift or translation used to create the image is 5 units down.
Answer:
5 units down.
Step-by-step explanation:
To solve this question, we need to compare the coordinates of the corresponding vertices of the two polygons and see how they change. A translation is a type of transformation that slides a figure by a certain distance and direction without changing its size or shape. The rule of a translation can be written as (x, y) -> (x + h, y + k), where h and k are the horizontal and vertical shifts, we can see that:
A (1, -1) maps to A’ (1, -6), which means x stays the same and y decreases by 5.B (3, -5) maps to B’ (3, -10), which means x stays the same and y decreases by 5.C (7, -5) maps to C’ (7, -10), which means x stays the same and y decreases by 5.D (5, -1) maps to D’ (5, -6), which means x stays the same and y decreases by 5.We can see that all the vertices have the same change in their coordinates: x stays the same and y decreases by 5. This means that the translation used to create the image is 5 units down. The rule of this translation can be written as (x, y) -> (x, y - 5). Therefore, the answer is 5 units down.
which statement is true?
Answer:
I believe the answer is B.
Step-by-step explanation:
Of 100 students surveyed, 42 own a dog, 34 own a cat, 15 own a dog and cat, and 9 own neither a dog nor a cat. Based upon the results, how many of the next 20 students surveyed would you expect to own a dog and cat. Record your answer and fill in the bubbles on your answer document. Be sure to use the correct place value.
PLEASE HELP!!!!
Answer: 3
Step-by-step explanation: 15% of the people surveyed had both a cat and a dog, so you would find 15% of 20. Find 15% of 20 by doing 20 x .15
What is the scale factor from the large triangle to the small triangle?
A. 1/2
B. 2/3
C. 1/3
D. 3/4
Can somebody give me an review over how to solve systems of equations by substitution and elimination? PLEASE HELP I forgot how to do it and my Algebra EOC is TOMORROW!! I provided an example question and I need LONG ACCURATE and HELPFUL explanations, not a one sentence response (or I will report you). PLEASE HELP ME!!!
Answer:
Price per large envelope = $1.42 (option A)
Price of each postcard = $0.35 (not asked for in this specific question)
Step-by-step process for solution given below
Step-by-step explanation:
The first thing to do for this problem and other similar problems is to set up the system of linear equations to be solved
We start with the unknowns and provide variable names for these unknowns
There are two unknowns here - the cost of each postcard and the cost of each large envelope
Let
x = cost of one postcard
y = cost of one large envelope
Customer 1 bought 14 postcards(cost = 14x) and 5 envelops(cost = 5y) for a total cost of $12
We can set up this as an equation:
12x + 5y = 12 ............ [1]
Customer 2 bought 10 postcards(cost = 10x) and 15 envelops(cost = 15y) for a total cost of $24.80
This translates to the following equation:
10x + 15y = 24.80 .... [2]
Let's re-write these equations one below the other for easier solution:
[tex]\begin{amatrix}14x+5y=12\dots[1]\\ 10x+15y=24.8\dots[2]\end{amatrix}[/tex]
Solving by substitution:
From any one of the above equations, express one variable in terms of the other variable and substitute for that variable in the other equation to solve.
Take equation [1]
[tex]14x+5y=12[/tex]
Let's express x in terms of y.
Move 5y to the right:
[tex]14x=12-5y[/tex]
[tex]x =\dfrac{12-5y}{14}[/tex]
Use this expression in y for x in equation [2]
[tex]10x + 15y = 24.8\\\\\implies 10 \cdot \dfrac{12-5y}{14}+15y=24.8\\\\\implies \dfrac{\left(12-5y\right)\cdot \:10}{14} + 15y = 24.8\\\\\implies \dfrac{\left(12-5y\right)\cdot \:10}{14} + 15y = 24.8\\\\[/tex]
Multiply throughout by 14:
[tex]14 \cdot \dfrac{\left(12-5y\right)\cdot \:10}{14} + 14\cdot 15y = 14 \cdot 24.8\\\\(12-5y)10 + 210y = 347.2\\\\120 - 50y + 210y = 347.2\\\\120 + 160y = 347.2\\\\160y = 347.2- 120\\\\160y = 227.2\\\\y = \dfrac{227.2}{160}\\\\y = 1.42[/tex]
Substitute y = 1.42 in equation [tex]x=\dfrac{12-5y}{14}[/tex]
[tex]x=\dfrac{12-5\cdot \:1.42}{14}\\\\x = 0.35\\\\[/tex]
So the cost of each large envelope was $1.42 and cost of each postcard was $0.35
Answer is option A
Solve by elimination
The idea here is to get the coefficients of one of the variables the same in both equations by multiplying / dividing one or both of the equations by some factor and then add/subtract to isolate the other variable and solve
For equations 1 and 2 do the following
Subtract the equations:
[tex]70x+105y=173.6\\-\\70x+25y=\;\;\;\;\;60\\\\[/tex]
-------------------------------
[tex]80y=113.6[/tex]
y = 113.6/80 = 1.42 as before
Substitute for y in equation 1 and solve for x
14x + 5y = 12 => 14x + 5(1.42) = 12
=> 14x + 7.1 = 12
=> 14x = 12 - 7.1
=> 14x = 4.9
=> x = 4.9/14 = 0.35 as before
I personally prefer solving by elimination since solving by substitution involves heavy duty fractional expressions
really dont understand can someone help me
Answer: 30.25 cm2.
Step-by-step explanation:
Given: Perimeter of a square = 22 cm.
Concept used: Area of a square = side2 Perimeter of a square = 4 × side.
Calculations: Let the side of the square be 'a' Perimeter of a square = 22 cm. ⇒ 4a = 22. ⇒ a = 5.5 cm. ...
∴ Area of square is 30.25 cm2.
Please help will give brainlest and special thanks
Answer:
To find the x-intercept, substitute in
0 for y
and solve for x. To find the y-intercept, substitute in
0 for x
and solve for y.
x-intercept(s): (−5,0)
y-intercept(s): (0,10)
Step-by-step explanation:
90 30 + 50 +(2x+10)=90
PLEASE HELP
Can someone please help, my teacher wants this done a certain way and I don't know how to do it.
HELPPPPPP PLSSS DUE TMRW
Answer:
13
13
Step-by-step explanation:
-7+6= 7+6= 13
-7+6= 7+6= 13
What is the area of Z?
Answer:
t = 5 kilometers
Step-by-step explanation:
From the given figure,
Perimeter = 18 kilometers
Now, the formula for perimeter of a rectangle = 2(l + b)
Where,
'l' is the length of the rectangle
and
'b' is the breadth of the rectangle.
Since length is the longest side of a rectangle, therefore from the given figure
=> l = t kilometers
and
=> b = 4 kilometers
Substituting values in the formula,
18 = 2(t + 4)
=> 18/2 = t + 4
=> 9 = t + 4
=> 9 - 4 = t
=> t = 5 kilometers
Answer:
5 km
Step-by-step explanation:
We know that the perimeter of this rectangle is 18km.
We also know that 1 side is 4km.
Given the perimeter formula:
[tex]P=2(l+w)[/tex]
We can substitute our given values:
18=2(4+w)
Solve the right side
18=8+2w
subtract 8 from both sides
10=2w
divide both sides by 2
5=w
This means that z, the width, is 5 km.
Hope this helps!
Please help with this one too! Thanks a bunch!♡
The rule is x→y=−2x. c Can you mark all the points that fit the rule on a coordinate plane?
Step-by-step explanation:
Y=0,-2,2
X=-1,0,1
Since x represent y = - 2x
The points that fit the rule on a coordinate plane are (0, 0), (1, -2), (2, -4) and (3, -6)
Selecting the points that fit the rule on a coordinate plane?From the question, we have the following parameters that can be used in our computation:
Rule: x→y=−2x
Express properly
So, we have the following representation
Rule: x → y = −2x
As an equation, we have
y = -2x
Next, we set values for x and calculate the value of y
Using the above as a guide, we have the following:
x : 0 → y = −2(0) = 0
x : 1 → y = −2(1) = -2
x : 2 → y = −2(2) = -4
x : 3 → y = −2(3) = -6
So, the points that fit the rule on a coordinate plane are (0, 0), (1, -2), (2, -4) and (3, -6)
Read more about linear relation at
https://brainly.com/question/30318449
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Question is in the picture
help me please i need to answer this
The tape diagram represents an equation. Write an equation to represent the image.
Answer: 6t = 9
Step-by-step explanation:
What is visually explicable is that the 2 tape diagrams are equal.
One tape diagram equals 9, one is divided into 6 equal parts, each equals t.
6t's make up a diagram that is equal to a diagram equal to 9.
therefore 6t=9
Thank you for your help! :D
The number of times Maria drove the car on day 4 is 7 times.
How many times did Maria drive her car on day 4?A line graph is a graph that connects different data points on a graph using a straight line. A line graph is made up of a x-axis and a y-axis. In the line graph given, the number of days is on the x-axis and the number of times the car was driven is on the y-axis. A line graph is used to show quantitative data. Line graphs are used to visualise data.
In order to determine the number of times Maria drove the car on day 4, locate where day 4 is on the x-axis. Then trace 4 upward toward a data point. When the data point is located, trace it to the y-axis. When day 4 is traced to the y-axis, the value gotten is 7.
To learn more about line graphs, please check: brainly.com/question/27252279
Answer:
She drove her car 7 times on day 4.
Step-by-step explanation:
The left column is how many times she drove her car and on day 4, the yellow dot is on line 7.
Help me solve question 2; both parts.
For an experiment, Bea recorded how much each of 14 seedlings grew in one month. She made a line plot to show the data. Which value occurred most often?
Angelica can ride her bike 30 miles in five hours. At this rate, how many miles will angelica ride in 3 hours?
Explanation:
30/5=6
6*3=18
Therefore, she can ride approximately 18 miles in 3 hours.
"Pure mathematics is, in its way, the poetry of logical ideas" -Albert Einstein
The table shows the results of 500 experiments. Each experiment involved one person choosing one card from each of two identic decks of cards, labeled 1 through 5. What is the experimental probability of a person choosing a 2, then a 3? Express the answer as percent. ( I really need help with this, I tried looking at my notes and my brain literally can’t function )
HELP ASAP PLEASSEEEE
Answer:
-2
Step-by-step explanation:
Answer: -2
Step-by-step explanation: 5 x 2 = 10
5 x -2 = -10
-5 x 2 = -10
Basically reverse the process with division, if there is one negative the answer will be negative.
Question 8!!
Total area= area of rhombus + area of triangle
Answer:
total area of the given figure is 126
step by step guide:
1) 14×6+1/2×14×6
2) 84+42
3) =126
The line plot displays the number of roses purchased per day at a grocery store.
Which of the following is the best measure of variability for the data, and what is its value?
Group of answer choices
The range is the best measure of variability, and it equals 8.
The range is the best measure of variability, and it equals 2.5.
The IQR is the best measure of variability, and it equals 8.
The IQR is the best measure of variability, and it equals 2.5.
The line plot:
Answer:
D would be correct. The IQR is the best measure of variability, and it equals 2.5.
Step-by-step explanation:
Because there are two outliers present which are 1 and 2, the best answer would be the IQR.
PLEASE PUT BRAINLIEST
Kyle has a storage box that is 2 ft. long, 3 ft. high, and has a volume of [tex]12ft^{3}[/tex]
Myla has a storage box that is 4 ft. high, 2 ft. long, and has a volume of [tex]16ft^{3}[/tex]
What are the widths of Kyle and Myla's boxes? Explain how you know.
help please! and please have easy explanation that's easy to understand :))
Answer:
OK so, volume= length x width x height
so, if the length of kyles box is 2, and his height is 3, but the volume is 12, then the width would be 2.
2 x 2 x 3=12
however, for myla, if her box is, 2 feet long and 4 feet high, but the volume is 16, then, her width is also 2.
2 x 2 x 4= 16
a way to look at this is, in the problem you are given the height and length, so, if its length times width times height, take your given length and multiply it by a number that will make it equal your given volume.
for example, let q=width, let m=height, and let j=length, p=volume, h=random variable.
j (x) h (x) m=p
its your job to find h.
hope this helps!
Step-by-step explanation:
Solve: 8/12=_/15, multiply 8/12 with a number that will give you _/15
.........................
Answer: 10
Step-by-step explanation:
20*6*8=960
960/(12*8)=10
Answer:
10
Step-by-step explanation: volume=l*w*h 20*6*8=960 12*8*10=960
Anyone knows the answer???
Answer:b
Step-by-step explanation:
Answer:
#3 points are
(-4, 2)
(4, 2)
(-4, -2)
(4, 0)
#4 scale factor = 1/4
#5 scale factor = 1/2
Step-by-step explanation:
#3
take the given points and multiply the x and y by 2/3
#4 take any point and compare it to a similar point on the dilated graph. for example, you take a point from the original graph (-2, 4) and a point from the dilated graph (-1/2, 1) since you multiply -2 by 1/4 to get -1/2, that is your scale factor.
#5 same as #4 but with different points
A diamond merchant received a shipment of 4 ⅔ pounds of diamonds. She divided the diamonds into 6 equal lots and sold them to jewelers for making rings and necklaces. What was the weight of the diamonds in each lot?
Answer:7/9 of a pound in each lot
Step-by-step explanation:4 2/3 = 14/3
14/3 divided by 6 will give us 14/18 which simplifies to 7/9
Answer quick quickest gets brainliest
For each of the shapes below, state if its a regular polygon, irregular polygon or neither
Answer:
A and B - irregular, C - neither, D and E - regular----------------------------
Regular polygon has congruent sides and angles.
Irregular polygon has different sides and angles.
According to markings on figures and properties we can state:
A) Irregular 6-sided polygon, irregular hexagon;B) Irregular 4-sided polygon, isosceles trapezoid;C) Neither, not a polygon as no sides or angles, it is a circle;D) Regular 3-sided polygon, equilateral triangle;E) Regular 8-sided polygon, octagon.