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2 years ago

A hockey coach recorded the number of shots taken by the home team and the number taken by the visiting team in 20 games,

Mathematics

1 answer:

rosijanka [135]2 years ago

6 0

Answer:

The answer is "None of the above".

Step-by-step explanation:

In this question, both the team given data is the same, and when the coach calculates its value it will give the same value, that's why we can say that all the choices were wrong.

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A teacher was interested in knowing the amount of physical activity that his students were engaged in daily. He randomly sampled

klasskru [66]

Answer:

The standard error of the mean is 4.5.

Step-by-step explanation:

As we don't know the standard deviation of the population, we can estimate the standard error of the mean from the standard deviation of the sample as:

$\sigma_{\bar{x}}\approx\frac{s}{\sqrt{n}}$

The sample is [30mins, 40 mins, 60 mins, 80 mins, 20 mins, 85 mins]. The size of the sample is n=6.

The mean of the sample is:

$\bar{x}=\frac{1}n} \sum x_i =\frac{30+40+60+80+20+85}{6}=52.5$

The standard deviation of the sample is calculated as:

$s=\sqrt{\frac{1}{n-1}\sum (x_i-\bar x)^2} \\\\ s=\sqrt{\frac{1}{5}\cdot ((30-52.5)^2+(40-52.5)^2+(60-52.5)^2+(80-52.5)^2+(20-52.5)^2+(85-52.5)^2}\\\\s=\sqrt{\frac{1}{5} *3587.5}=\sqrt{717.5}=26.8$

Then, we can calculate the standard error of the mean as:

$\sigma_{\bar{x}}\approx\frac{s}{\sqrt{n}}=\frac{26.8}{6}= 4.5$

6 0

3 years ago

HELP ME PLZZZ QUICK :((

sveticcg [70]

Answer: the answer is 20

Step-by-step explanation:

I did the test it is the answer if you need help with another one let me know and ill help with the next problem

4 0

3 years ago

What is the area of a 4.2 yard square?

SOVA2 [1]

Answer:

37.8 square feet

Step-by-step explanation:

4 0

3 years ago

In her wallet, Ms. Thompson has one-dollar, five-dollar, and ten-dollar bills, totally $171. She has the same number of five-dol

MissTica

Let's check. 6 one-dollars = $6 15 five-dollars = $75 9 ten-dollars = $90 Add them all up to get $171, so that is correct. Add the number of one-dollar bills and the number of ten-dollar bills together. 6 + 9 = 15, which is the number of five-dollar bills, so that is correct as well. Add all the numbers of bills together, 6 + 9 + 15 = 15 + 15 = 30, so that is correct

5 0

3 years ago

Read 2 more answers

I need help with question 3, I chose the answers that made the most sense but it keeps telling me I'm wrong?

Zarrin [17]

Answer: DL, PS, SL

Step-by-step explanation:

All sides of a square are congruent.

8 0

2 years ago