in the frequency of 100 families given below the numbers of families corresponding to expenditures group 20-40and 60-80are missing from the table however the median is known be 50 find the missing frequency. Expenditures 0-20 20-40 40-60 60-80 80-100
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Exp Frequency cumulative freq
0-20 14 14
20-40 x 14+x
40-60 28 42+x
60-80 y 42+x+y
80-100 15 57+x+y
____
100
Step-by-step explanation:
now substituting value of x in eq 1, 57+x+y = 100,
57 + 22+y=100
y=21
the number of families corresponding to expenditure groups 20—40 is = 22 and 60—80 is = 21 in the table
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