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Question

What is the cumulative frequency of the modal class of the following distribution?

Class3669912121515181822124Frequency713102342116


Solution

Class frequency CF
3-6 7 7
6-9 13 20
9-12 10 30
12-15 23 53
15-18 4 57
18-21 21 78
21-24 16 94


from above we can see the modal class is 12-15
and hence its cumilative frequency is 53

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