The International Bottled Water Association says that Americans on the average drink 4.6 (8-oz.) servings of water a day. Assume that the number of 8-oz. servings of water is approximately normally distributed with the standard deviation of 1.3 servings. (Give your answers correct to four decimal places.)
(a) What proportion of Americans drink more than the recommended 8 servings?
(b) What proportion of Americans drink less than half the recommended 8 servings?