Find the missing cumulative frequency.
x
2-3
3-4
4-5
5-6
6-7
frequency
12
36
24
48
52
cumulative frequency
12
48
?
120
172

48

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24

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72

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56

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Solution

The correct option is C $72$
Cumulative frequency can also defined as the sum of all previous frequencies up to the current point.
So, $48 + 24 = 72$
So, the missing cumulative frequency is $72$ .

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