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Suppose the mean length of time that a caller is placed on hold when telephoning a customer service center is 180 seconds, with standard deviation

Suppose the mean length of time that a caller is placed on hold when telephoning a customer service center is 180 seconds, with standard deviation 30 seconds. Find the probability that the mean length of time on hold in a sample of 1,200 calls will be within 0.1 second of the population mean.

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