Weekly income of 600 families is tabulated below


Compute the median income.


First we construct a cumulative frequency table.


It is given that, n = 600


n/2 = 600/2 = 300


Since, cumulative frequency 440 lies in the interval 1000 – 2000.


Here, (lower median class) l = 1000


f = 190, cf = 250, (class width) h = 1000


and (total observation) n = 600




= 1000 +


= 1000 + 5000/19


= 1000 + 263.15 = 1263.15


Hence, the median income is Rs.1263.15.


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