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, c_f = 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.