Find the missing frequency.

Find the missing frequency.

The frequency distribution of 100 families given below, the number of families corresponding to the expenditure groups, 20-40 and 60-80 are missing from the table. However the mean of the distribution is known to be 50. Find the missing frequency.

Expenditure Frequency

0-20 14

20-40 f1

40-60 27

60-80 f2

80-100 15


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