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The mean television viewing time for Americans is 15 hours

The mean television viewing time for Americans is 15 hours per week (Money, November 2003). Suppose a sample of 60 Americans is taken to further investigate viewing habits.

Assume the population standard deviation for weekly viewing time is σ = 4 hours.

a. What is the probability the sample mean will be within 1 hour of the population mean?

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

Assume the population standard deviation for weekly viewing time is σ = 4 hours.

a. What is the probability the sample mean will be within 1 hour of the population mean?

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

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