# Question: university students have reported an average of 72 hours of...

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University students have reported an average of 7.2 hours of sleep per night, with a standard deviation of 40 minutes. If the amount of sleep is assumed to be normally distributed, answer the following questions. If a university student is selected at random:

(a) What is the probability that a university student sleeps more than 8 hours?

(b) What is the probability a university student sleeps between 7 to 8 hours?