alleryStart learning →Classes 0-10 and 10-20 have frequencies 4 and 6. Using class marks, what is the mean?
A15
B11
C10
D12
Answer & Solution
Correct answer: B. 11
Class marks 5 and 15 give (5 x 4 + 15 x 6)/10 = 110/10 = 11.
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