Finding percentage of population gets sleep


Assignment:

According to the Sleep Foundation, the average night's sleep is 6.8 hours ( Fortune, March 20, 2006). Assume the standard deviation is .6 hours and that the probability distribution is normal.

a. What is the probability that a randomly selected person sleeps more than 8 hours?

b. What is the probability that a randomly selected person sleeps 6 hours or less?

c. Doctors suggest getting between 7 and 9 hours of sleep each night. What percentage of the population gets this much sleep?

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Basic Statistics: Finding percentage of population gets sleep
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