Alcohol and drug use peaks among U.S. __________ and then declines steadily with age

In Western societies menarche generally occurs at age ____, whereas in developing countries it generally occurs at age ____

a. 10.5; 17 b. 11.5; 16 c. 12.5; 15 d. 13.5; 14

With a fairly balanced distribution of (neither skewed nor

bimodal), the most appropriate measure of central tendency is the a. mean b. median c. mode d. none of these