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Unit 4 Day 9 Quiz #2

Last updated over 4 years ago

9 questions

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Question 1

1.

A town’s January high temperatures average 36ºF with an standard deviation of 12ºF, while in July the mean high is 69ºF and the standard deviation is 8ºF. We will answer: in which month is it more unusual to have a day with a high temp of 55ºF?

First calculate the z-score for 55 degrees in January.
Round your answer to three places past the decimal.

Question 2

2.

A town’s January high temperatures average 36ºF with an standard deviation of 12ºF, while in July the mean high is 69ºF and the standard deviation is 8ºF. We will answer: in which month is it more unusual to have a day with a high temp of 55ºF?

Second calculate the z-score for 55 degrees in July.
Round your answer to three places past the decimalf if needed.

Question 3

3.

A town’s January high temperatures average 36ºF with an standard deviation of 12ºF, while in July the mean high is 69ºF and the standard deviation is 8ºF. Now answer: in which month is it more unusual to have a day with a high temp of 55ºF?

Give your answer and explain using the statistics information we have discussed in class.

Question 4

4.

The speed of cars driving past AHHS were measured, where the speed limit is 20 mph in the school zone. The mean of 100 readings was 23.84 mph, with a standard deviation of 3.56 mph.
If a car's calculated z-score for speed was 1.64, how fast was the car traveling?
Round your decimal to 3 places past the decimal.

Question 5

5.

The Virginia Cooperative Extension reports that the mean weight of yearling Angus steers is 1152 pounds. Suppose the standard deviation is 84 pounds and a Normal Model is useful for making predictions.

Using N(1152, 84) what percent of the cows weigh less than 975 pounds?
Round your percent answer to one place past the decimal.

Question 6

6.

The Virginia Cooperative Extension reports that the mean weight of yearling Angus steers is 1152 pounds. Suppose the standard deviation is 84 pounds and a Normal Model is useful for making predictions.

Using N(1152, 84) what percent of the cows weigh more than 1225 pounds?
Round your percent answer to one place past the decimal.

Question 7

7.

The Virginia Cooperative Extension reports that the mean weight of yearling Angus steers is 1152 pounds. Suppose the standard deviation is 84 pounds and a Normal Model is useful for making predictions.

Using N(1152, 84) what is the cutpoint weight for the lowest 20% of weights?
Round your answer to one place past the decimal point.

Question 8

8.

The Virginia Cooperative Extension reports that the mean weight of yearling Angus steers is 1152 pounds. Suppose the standard deviation is 84 pounds and a Normal Model is useful for making predictions.

Using N(1152, 84) what percent of the cows weigh between 1100 and 1200 pounds?
Round your percent answer to one place past the decimal point.

Question 9

9.

The Virginia Cooperative Extension reports that the mean weight of yearling Angus steers is 1152 pounds. Suppose the standard deviation is 84 pounds and a Normal Model is useful for making predictions.

Using N(1152, 84) what is the cutpoint weight for cows in the top 10 percent?
Round your answer to one place past the decimal point.