Question #1) According to Neilson & Co adults watch an average of 30 hours of a TV a week. Assume the population standard deviation for ‘hours of TV watched per week’ is 12 hours. If a random sample...

Question #1)

According to Neilson & Co adults watch an average of 30 hours of a TV a week. Assume the population standard deviation for ‘hours of TV watched per week’ is 12 hours.

• If a random sample of 30 adults is selected, what is the probability the sample mean for hours of TV watched per week is less than 28 hours?

• If a random sample of 30 adults is selected, what is the probability the sample mean for hours of TV watched per week is more than 31 hours?

• If a random sample of 30 adults is selected, what is the probability the sample mean for hours of TV watched per week is between 28 and 31 hours?