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The times for the mile run of a large group of male college students are approximately...

The times for the mile run of a large group of male college students are approximately Normal with mean 7.1 minutes and standard deviation 0.79 minutes. Use the 68-95-99.7 rule to answer the following questions. (Start by making a sketch of the density curve you can use to mark areas on.)

(a) What range of times covers the middle 99.7% of this distribution?
(b) What percent of these men run a mile in more than 7.89 minutes?

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