Question: According to the U.S. National Center for Health Statistics, males who are six feet tail and between 18 and 24 years of age have a mean weight of 180 pounds. If the weights are normally distributed with a standard deviation of 16.4 pounds, use z-scores to find the percentage of such males that weigh

a) between 170 and 190 pounds.

b) less than 160 pounds. Interpret result.