EMPOWERgmat PS Series:
Block 1, Question 4
A College runs 25 classes on Monday. Ten of the classes have an average size of 14.2 students while the other fifteen classes have an average size of 12.2 students. What is the average class size, in students, of all 25 classes run on Monday?
A. 12.5
B. 13
C. 13.2
D. 13.5
E. 14
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EMPOWERgmat system. Even if you're not sure about your answer or your rationale, share your explanation to help boost your learning and earn a chance to win.
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The OA and official explanation will be held until the 48 hour window has lapsed.
Total difference above the average = total difference below the average.
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