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Stats: Data and Models | 4th Edition | ISBN: 9780321986498 | Authors: Richard D. De Veaux, Paul F. Velleman, David E. Bock
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Winter Olympics 2010 downhill Fifty-nine men completed the

Chapter 5, Problem 39E

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QUESTION:

Problem 39E

Winter Olympics 2010 downhill Fifty-nine men completed the men’s alpine downhill race in Vancouver. The gold medal winner finished in 114.3 seconds. Here are the times (in seconds) for all competitors (espn.go.com/olympics/winter/2010/results/_/sport/1 /event/2):

a) The mean time was 117.34 seconds, with a standard deviation of 2.465 seconds. If the Normal model is appropriate, what percent of times will be less than 114.875 seconds?

b) What is the actual percent of times less than 114.875 seconds?

c) Why do you think the two percentages don’t agree?

d) Make a histogram of these times. What do you see?

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QUESTION:

Problem 39E

Winter Olympics 2010 downhill Fifty-nine men completed the men’s alpine downhill race in Vancouver. The gold medal winner finished in 114.3 seconds. Here are the times (in seconds) for all competitors (espn.go.com/olympics/winter/2010/results/_/sport/1 /event/2):

a) The mean time was 117.34 seconds, with a standard deviation of 2.465 seconds. If the Normal model is appropriate, what percent of times will be less than 114.875 seconds?

b) What is the actual percent of times less than 114.875 seconds?

c) Why do you think the two percentages don’t agree?

d) Make a histogram of these times. What do you see?

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