hmazariegos wrote:
The table above shows the distribution of scores on a geography quiz given to a class of 25 students. Which of the following is closest to the average (arithmetic mean) quiz score for the class?
A. 8.6
B. 8.5
C. 8.4
D. 8.3
E. 8.0
Attachment:
gmat quiz question.JPG
Using the weighted average formula, we have:
(6 x 2 + 7 x 4 + 8 x 7 + 9 x 9 + 10 x 3)/25
(12 + 28 + 56 + 81 + 30)/25
207/25 = 8.28, which is about 8.3.
Answer: D
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