• Diastolic blood pressures are assumed to follow a normal distribution with a mean of 85 and a standard deviation of 12.

• What proportion of people have diastolic blood pressure less than 90?

• What proportion have diastolic blood pressures between 80 and 90?

• If someone has a diastolic blood pressure of 100, what percentile is he/she in?

• Consider the data described in Problem 10. If a sample of 15 participants are sampled, what is the probability that their mean diastolic blood pressure exceeds 90?

16. Diastolic blood pressures are approximately normally distributed with a mean of 75 and a standard deviation of 10.

• What is the 90^th percentile of diastolic blood pressure?

• If we consider samples of 20 patients, what is the 90^th percentile of the mean diastolic blood pressure?