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The amount of time that a customer spends waiting at an airport check-in counter is a random variable with mean 8 minutes and standard deviation

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The amount of time that a customer spends waiting at an airport check-in counter is a random variable with mean 8 minutes and standard deviation 3.5 minutes. Suppose that a random sample of n = 49 customers is observed. Find the probability that the average time waiting in line for these customers is between 6 and 9 minutes

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