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)84.3
B)85.0
C)85.7
D)none of these
E)It cannot be determined.

Question

Quizplus · Accepted Answer

To find the overall mean score for all students, we need to take the weighted average of the mean scores for each section. The weight for section A is 15/35 (since there are a total of 35 students), and the weight for section B is 20/35. Thus, the overall mean score is (15/35)*80 + (20/35)*90 = 85.7. Therefore, the answer is choice C, 85.7.

Two Sections of a Class Took the Same Quiz