Question: 21 The International Bottled Water Association says that Americans on the average drink 4.6 (8-oz.) servings of water a day (http://www.bottledwater.org/public/summary.htm ). Assuming that the number of 8-oz. servings of water is approximately normally distributed with a standard deviation of 1.4 servings, what proportion of Americans drink:

a. More than the recommended 8 servings

a. P(x > 8) = P[z > (8 – ?)/ ?]

= P[z > Solve]

= Solve = Solve = Solve %

b. Less than half the recommended 8 servings

b. P(x < 4) = P[z < (4 – ?)/ ?]

= P[z < -0.43]

= Solve = Solve = Solve %