1. suppose people drive an average of 13,000 miles per year with a standard deviation of 2,500 miles per year. What is the probability that a randomly selected sample of 36 drivers will drive, on average, more than 12,750 miles?

1. Suppose a claim is made that the mean age of members of a golf club is 52 years. The population standard deviation is 6 years. Evaluate this claim if a random sample of 50 members has a mean age of 56 years.

1. The systolic blood pressure (given in millimeters) of males has an approximately normal distribution with mean = 125 and standard deviation = 14. Systolic blood pressure for males follows a normal distribution. Calculate the z-scores for the male systolic blood pressures 100 and 150 millimeters.