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According to a recent study, the average night's sleep is 6.9 hours. Assume that the standard deviation is 0.8 hours and that the probability distribution

According to a recent study, the average night's sleep is 6.9 hours. Assume that the standard deviation is 0.8 hours and that the probability distribution is normal. a. What is the probability that a randomly selected person sleeps for more than 8 hours? (2 marks) b. 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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