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1 year ago

Which statement must be true?

Mathematics

1 answer:

ohaa [14]1 year ago

8 0

Answer:

Each distribution has a different mean and a different standard deviation.

Step-by-step explanation:

The mean of a data set is the middle number. So, the number/place in the middle of each graph should be considered.

And from observing these graphs, they are all bell curves. The middle of a bell curve is the mean, and the *steeper the bell curve, the smaller the standard deviation. *

-The orange and blue graphs are barely overlapping, so their middle number of the data set must not be shared. (indicating that the mean must be different).

-The steepness and height of each bell curve is different, indicating that the standard deviation must be different

*{why? : If there are more values/numbers/outcomes that are close to the mean, (which would look like a very tall bell curve), the standard deviation (standard deviation is how spread out the values are from the mean on average) is much smaller. }*

The steeper the bell curve, the smaller the standard deviation.

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You randomly select a card from a 52-card deck. Find the probability of selecting a 7 or an Ace.

erik [133]

Answer:

15.38%

Step-by-step explanation:

There are 4 7's in a deck of 52 cards.

There are 4 Aces in a deck of 52 cards.

4+4 = 8

8/52, or 15.38%

6 0

2 years ago

Read 2 more answers

A researcher wants to know how professional athletes in her city feel about safety measures. She obtains a list of 952 professio

mojhsa [17]

Answer:

For this case the population represent all the professional athletes in the researcher city and we can assume that the sample size for tis population is N =982 and represent all the individuals of interest for the study and the parameter of interest is the proportion of athletes who believe that the enforcement of safety measures needs to be completely overhauled $p$ .

In order to estimate te parameters of the population the researcher select a sample of 400 professional athletes and just 86 of them returns the questionnaire sent. So then the real sample is the n =86 people who return the info, because the other people are part of the non response rate, and from this sample she found that the proportion of athletes who believe that the enforcement of safety measures needs to be completely overhauled is $\hat p=0.76$ .

Step-by-step explanation:

For this case the population represent all the professional athletes in the researcher city and we can assume that the sample size for tis population is N =982 and represent all the individuals of interest for the study and the parameter of interest is the proportion of athletes who believe that the enforcement of safety measures needs to be completely overhauled $p$ .

In order to estimate te parameters of the population the researcher select a sample of 400 professional athletes and just 86 of them returns the questionnaire sent. So then the real sample is the n =86 people who return the info, because the other people are part of the non response rate, and from this sample she found that the proportion of athletes who believe that the enforcement of safety measures needs to be completely overhauled is $\hat p=0.76$ .

6 0

2 years ago

Suppose the function y = 30,000(1.06)x models the annual profit for a small business x years after 2000. Find the profit at the

goldfiish [28.3K]

From 2000 to 2011, there are 11 years. From the given function, we can calculate the profit for a small business at the end of 2011 by substituting 11 to the x of the given equation.
y = (30,000)(1.06)(11)
y = 349,800
Thus, the profit at the end of 2011 is approximately $349,800.

4 0

3 years ago

Find the base of a parallelogram with the area of 60 in.² and height of 4 inches use the formula for the area of the parallelogr

Alexxx [7]

A = bh
60 in.² = b(4)
60/4 = b
b = 15 inches

Hope this helped!

7 0

2 years ago

Maria will spin the arrow on the spinner 3 times.

Anna35 [415]

Well if those are the only 3 options of a segment, then there is a 1/3 chance of landing on A, then a 1/3 chance of landing on B, then a 1/3 chance of landing on C. Multiply the fractions together to get 1/27. However that isn't one of your answers. I'm thinking that the spinner has 4 sections, meaning 1/4 chance of A, then 1/4 chance of B, then 1/4 chance of C. Multiply these together to get 1/64, which is one of your answers. That's my input anyway

5 0

2 years ago