Suppose that the mean systolic blood pressure of healthy adults is normally distributed with a mean of 120 millimeters of mercury (mm Hg) and a standard deviation of 5.6 millimeters of mercury (mm Hg).
• If an individual healthy adult is selected at random, what is the probability that the individual's blood pressure will be between 120 and 121.8 mm Hg?
• If a sample of 30 healthy adults is selected at random, what is the probability that their mean blood pressure will be between 120 and 121.8 mm Hg? Use the Central Limit Theorem.