Answer :

For equal class intervals, we will solve by finding mid points of these classes using direct method.

We have got


Σfi = 44 + f and Σfixi = 752 + 20f


mean is given by



( given: mean of pocket allowance is 18)


792 + 18f = 752 + 20f


20f – 18f = 792 – 752


2f = 40


f = 20


Thus, f is 20.


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