The Weight Losses for Participants in a Large Exercise and Diet

Multiple Choice

The weight losses for participants in a large exercise and diet study vary according to a Normal distribution with mean 14.5 pounds and standard deviation 3 pounds.
Approximately what percent of the participants lose more than 20.5 pounds?

A) 2.5 percent
B) 16 percent
C) 34 percent
D) 50 percent
E) 84 percent