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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
