Suppose that total carbohydrate intake in 12- to 14-year-old boys is normally distributed with a mean of 120 g/1000 calories and a standard deviation of 20 g/1000 calories. Approximately what percent of boys in this age range have carbohydrate intake less than 100 g/1000 calories? a. 16% b. 2.5% c. 50% d. 18.65%
