alleryStart learning →Classes 0-10, 10-20 and 20-30 have frequencies 4, 6 and 10. Using class midpoints, the mean is:
A18
B16
C20
D15
Answer & Solution
Correct answer: A. 18
Midpoints 5, 15, 25 give 20 + 90 + 250 = 360, and 360 divided by 20 is 18.
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