A student scored 78, 85, 92, and 88 on four math tests. What score does the student need on the fifth test to have an average score of exactly 87?

✓ Correct Answer: Option D

The desired total score for 5 tests is 87 * 5 = 435. The sum of current scores is 78 + 85 + 92 + 88 = 343. The score needed on the fifth test is 435 - 343 = 92.