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Question

Following information pertains to the daily income of 150 families. Calculate the arithmetic mean.

Income (in Rs)Number of FamiliesMore than 75150More than 85140More than 95115More than 10595More than 11570More than 12560More than 13540More than 14525


Solution

Income ClassNumber of FamiliesFrequencyMid Valuefminterval(cf)(f)(m)7585150150140=10808008595140140115=259022509510511511595=201002000105115959570=251102750115125707060=101201200125135606040=201302600135145404025=15140210014515525251503750Totalf=150fm=17,450

Mean =fmf=17,450150=Rs 116.33


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