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.

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Zarin Tasnim · Accepted Answer

Final Answer : C, Explanation :  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.

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

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