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The number of hours that a network server was down each month of the previous year is: 4, 4, 5, 1, 5, 1, 1, 2, 1, 2, 1, 2. Place a 95% confidence interval about the population mean number of down hours per month.

My thoughts:

mean = 29 / 12 = 2.4167

mean + Z(0.025) * s/sqrt(n)

mean - Z(0.025) * s/sqrt(n)

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