The weight of certain group of men follows normal curve, with average of 180 pounds and SD of 40 pounds. Fill in the blanks; explain briefly.
a. A man who weighed 110 pounds was at the ________percentile of the weight distribution.
b. To be at the 71th percentile of the distribution, a man needed to weight about _________ pounds
c. About what percentage of these men weighs between 230 pounds and 250 pounds?