Question

Draw histogram and frequency polygon on the same graph paper for the following frequency distribution.

Class	Frequency
$15-20$	$20$
$20-25$	$30$
$25-30$	$50$
$30-35$	$40$
$35-40$	$25$
$40-45$	$10$

Answer 1

$Class$	$ClassMark$ $\left(x_i\right)$	$f_i$
$15-20$	$17.5$	$20$
$20-25$	$22.5$	$30$
$25-30$	$27.5$	$50$
$30-35$	$32.5$	$40$
$35-40$	$37.5$	$25$
$40-45$	$42.5$	$10$