Two sections of a class took the same quiz. Section A had 15 students who had a mean score of 80, and Section B had 20 students who had a mean score of 90. Overall, what was the approximate mean score for all of the students on the quiz?
A) 85.7
B) 85.0
C) It cannot be determined.
D) 84.3
E) none of these

Question

Quizplus · Accepted Answer

The total number of students is 15 + 20 = 35. The total score is 15 * 80 + 20 * 90 = 1200 + 1800 = 3000. Therefore, the mean score is 3000 / 35 = 85.71428571428571. Rounded to the nearest tenth, the answer is 85.7.

Two Sections of a Class Took the Same Quiz