Question

Finding median graphically for the following grouped data ?

Class Interval	Frequency
0-5	03
5-10	06
10-15	11
15-20	08
20-25	06

Answer 1

$\Rightarrow$ We are going to form more than cumulative frequency table:

$Class-Interval$	$c.f.\left(morethan\right)$
More than $0$	$34$
More than $5$	$31$
More than $10$	$25$
More than $15$	$14$
More than $20$	$6$

$\Rightarrow$ We are going to form less than cumulative frequency table:

$Class-Interval$	$c.f.\left(lessthan\right)$
Less than $5$	$3$
Less than $10$	$9$
Less than $15$	$20$
Less than $20$	$28$
Less than $25$	$34$

$\Rightarrow$ Median is where both less than and more then curves meet.

$\therefore$ $Median=12.5$