Question

Write the median class of the following distribution:

Class-interval:	0−10	10−20	20−30	30−40	40−50	50−60	60−70
Frequency:	4	4	8	10	12	8	4

Answer 1

Consider the following distribution table.

Class	Frequency	C.F.
0−10	4	4
10−20	4	8
20−30	8	16
30−40	10	26
40−50	12	38
50−60	8	46
60−70	4	50
	N = 50

Here,

The cumulative frequency just greater than 25 is 26.

So, the median class is 30−40.