(b) Suppose the amount of time spent by retired people watching TV per day is approximately normally distributed with a mean of 6 hours and a standard deviation of 1.5 hours. What is the probability that the average number of hours spent watching TV per day by a random sample of 5 retired people is more than 7 hours?
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We are given that the mean time spent watching TV per day by retired people is 6 hours, and the standard deviation is 1.5 hours. So, the distribution of individual times can be represented as N(6, 1.5^2). Show more…
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