Suppose Lamont's exam score was at the 80^th percentile on an exam whose mean was 90.What was Lamont's exam score?

A) 76.81
B) 72.00
C) 80.00
D) Cannot tell without more information.

The percentile of a score tells us the percentage of scores that are equal to or less than it, but without knowing the distribution of scores (e.g., standard deviation, the shape of the distribution), we cannot determine the exact score from the percentile alone.