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?
Provide complete and step by step solution for the question and show calculations and use formulas.