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Probability using Z - score.

The mean television viewing time for Americans is 15 hours per week (Money, November 2003). Assume a sample of 60 Americans is taken to further investigate viewing habits. Suppose the population standard deviation for weekly viewing time is Q = 4 hours.

a) What is the probability sample mean within 1 hour with of the population mean?

b) What is the probability sample mean will be within 45 minutes of the population mean?

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