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Problems based on Normal Distribution

According to the Sleep Foundation, the average night's sleep is 6.8 hours. Suppose the standard deviation is 0.6 hours and that the probability distribution is normal.
a. What is the possibility that a random selected person sleeps more than 8 hours?
b. What is the possibility that a random 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?

Statistics and Probability, Statistics

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