A diet program suggests that its followers lose a mean of 15 pounds in the first six weeks of dieting, with a standard deviation of 3 pounds.a. Bill lost 21 pounds in his first six weeks. What proportion of dieters lost the same or more than he did?b. Bob lost 10 pounds in the first six weeks of dieting. What proportion of dieters would lose between the mean of 15 pounds and his loss of 10 pounds?c. Frank lost 17 pounds in his first six weeks. What proportion of dieters lost the same or less than he did?d. Fred was the star of the diet program and lost more weight than 93 percent of the patrons. How much weight did he lose?
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