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QUESTION
Suppose that we know that, in a population, spells of unemployment are normally distributed with a mean of 144 days and a standard deviation of 12...
Suppose that we know that, in a population, spells of unemployment are normally distributed with a mean of 144 days and a standard deviation of 12 days.
(a) What is the probability that a spell lasts more than 150 days?
(b) Researchers collect a random sample of 4 unemployment spells. What is the probability that the average spell lasts more than 150 days?
