Empirical Rule. Standard Deviation. HELP!?

Aub

New member
Running a mile. The times for the mile run of a large group of male college students are approximately Normal with mean 7.11 minutes and standard deviation 0.74 minutes. Use the 68-95-99.7 rule to answer:

a.) What range of times covers almost all (99.7%) of this distribution?
b.) What percent of these men run a mile in less than 6.37 minutes?

This is a homework problem and I would love to know the answer as well as how to figure it out. I cannot understand this!
 
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