If a student scored 90 on a test where the average score was 75, how many points above the average did they score?

To determine how many points above the average the student's score is, you simply need to subtract the average score from the student's score. In this case, the student scored 90, and the average score was 75.

When you perform the calculation:

90 (student's score) - 75 (average score) = 15

This result shows that the student scored 15 points above the average. Therefore, the choice indicating 15 points accurately represents the difference between the student's score and the average score. The method used here—subtracting the average from the individual score—is a straightforward approach to find how much higher a score is in comparison to the average.