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Describe Probability using Z - score

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

1) describe what is the probability the sample mean within 1 hour with of the population mean?

2) describe what is the probability the sample mean will be within 45 minutes of the population mean?

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