alleryStart learning →Classes 20-30, 30-40, 40-50 have frequencies 5, 10 and 5. What is the mean by class marks?
A33
B35
C38
D30
Answer & Solution
Correct answer: B. 35
(25 x 5 + 35 x 10 + 45 x 5)/20 = 700/20 = 35.
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