4 Researchers studying the effect of a new diet found that the weight loss over a one-month period by those on a diet was normally distributed with a mean of 5.5 pounds and a variance of 4 (pounds)2. What proportion of dieters gained weight? a. .0030 b. .1375 C. 9162 d. 9970 e. none of the above An airplane says 60% of its flights are on time. If we select 8 flights at random and assume independence, what is the probability that at least 1 flight is on time? a. 0.0113 b. 0.5518 C. 0.4482 d. 0.9887 e. 0.9987 none of the above