Question: A simple random televisions will be selected to test for the mean lifetime in hours.Assume that televisions lifetimes are normally distributed with population standard deviation

A simple random televisions will be selected to test for the mean lifetime in hours.Assume that televisions lifetimes are normally distributed with population standard deviation of 27 hours . How many televisions must be sampled so that a 99% confidence interval will have margin of error of 6 hours?

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