The mean television viewing for americans is 15 hour per week (Monday, November 2003). Suppose a sample of 80 Americans is taken to further investigate viewing habbits. Assume the population standard deviation for weekly viewing time is StdDev=5hrs.
A.)What is the probability the sample mean will be within 1 hour of the population mean (to four decimals)?
B.)What is the probability the sample mean will be within 45 minutes of the population mean (to four decimals)?