A sleep study found that the number of hours each person slept was normally
distributed. The study found that the average person slept 8.2 hours with a standard deviation of 0.7 hours.
1. What range of hours of sleep are the 99.7% closest to the mean?
2. The 2.5% of the people who slept the most got more than how many hours
of sleep?
3. The 16% of the people who slept the least got less than how many hours sleep?
