Question

The following are the daily expeditures (in $Rs$) of $30$ student in a school.

Ependiture (in $Rs$)	No. of students
$10-15$	$3$
$15-20$	$5$
$20-25$	$10$
$25-30$	$6$
$30-35$	$4$
$35-40$	$2$
Total	$30$

Find the class-marks of $20-25$ and $25-30$.

Answer 1

Class markes of $20-25$ is $22.5$ and

$25-30$ is $27.5$