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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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