Please answer questions 31, 30, and 13.

31. The distribution of foot lengths of adult males is approx normal with u - llinches and = 1. S inches. How many standard deviations bel or above the mean male foot length is Binches? A IS standard deviations above the mean B 15 standard deviations below the mean C 133 F above the mean 11 1.33 below the mean E 11 4 above the mean F 11 below the mean 30. Suppose The scenes on an exam are normally distributed with a mean of 75 paints , and a standard deviation of 8 points Between what two values are the middle 701 8 the scenes? beth A 72. 6 and 77.4 paints B 70.8 and 79.2 pants 66.7 and 83.3 points D 593 and 96.7 points E. cannot be determined for given information 13. A health and wellness coordinator is testing a new exercise regimen with her clients. She has 43 clients total. she plans to randomly assign 21 clients to the new exeuse program and 22 dientts to the old regimen. The mean resting heart rate of each group will be recorded after 6 weeks. what type of study is this