Mathematics

Problem

A survey records the weekly pocket money (in ₹) received by a group of children. The data are presented below:

Pocket money (₹)	10–20	20–30	30–40	40–50	50–60
Number of children	5	9	15	f	6

The modal amount of pocket money is ₹36. a. (i) Determine the missing frequency f. b. (ii) Find the total number of children included in the survey. c. (iii) After including the calculated value of f, justify whether the class 30–40 remains the modal class.

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