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2. The income of families per week is distributed with mean income of $ 12,000 and standard deviation of $ 600. Suppose that a random

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2. The income of families per week is distributed with mean income of $ 12,000 and standard deviation of $ 600. Suppose that a random sample of 36 families is drawn from this population. What is the probability that the mean income of these 36 families will exceed $ 12,200

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