(a) A score of 200 is at the 50th percentile.

(b) Recall that 16 percent of the scores fall below a score of 175, which means that this score is at the 16th percentile.

(c) You already determined that a score of 250 has only about 2 percent of the scores above that value. If about 2 percent is above the value of 250, then 98 percent must be below that value. The answer is the 98th percentile.