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Suppose that the amount of time spend by working students weekly is normally distributed with the standard deviations of 25 minutes. A random sample of

Suppose that the amount of time spend by working students weekly is normally distributed with the standard deviations of 25 minutes. A random sample of 125 observation is drawn and the sample mean is computed as 150 minutes. Determine the 95 % confidence interval estimate of the population mean.

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