Question

Write the median class for the following frequency distribution:

Class-interval:	0−10	10−20	20−30	30−40	40−50	50−60	60−70	70−80
Frequency:	5	8	7	12	28	20	10	10

Answer 1

We are given the following table.

Class Interval	Frequency	Cumulative Frequency
0−10	5	5
10−20	8	13
20−30	7	20
30−40	12	32
40−50	28	60
50−60	20	80
60−70	10	90
70−80	10	100
	N = 100

Here, N = 100

$\therefore \frac{N}{2}=50$

The cumulative frequency just greater than 50 is 60.

So, the median class is 40−50.