Q. 34.5( 52 Votes )

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Answer :

To find f, we’ll need to find mean pocket allowance by direct method and equate it to the given mean pocket allowance, 18.

So, let’s construct a table finding midpoints and stating frequencies.



Mean is given by



[given, mean = 18]


18(44 + f) = 752 + 20f


792 + 18f = 752 + 20f


20f – 18f = 792 – 752


2f = 40


f = 40/2


f = 20


Thus, the missing frequency f is 20.


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