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Historic records show that the mean duration of all activity is expected to be 8 days with a standard deviation of 2.4 days. What

Historic records show that the mean duration of all activity is expected to be 8 days with a standard deviation of 2.4 days. What duration should be used if there is to be a 95% confidence that the duration will not be exceeded? What is the probability that the duration will actually exceed 10 days?

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