Question

Construct a frequency polygon from the following data:

Class-intervals	$0-4$	$5-9$	$10-14$	$15-19$	$20-24$
Frequency	$5$	$8$	$12$	$9$	$4$

Answer 1

$Class-intervals$	$Class-mark$	$Frequency$
$-3--1$	$-2$	$0$
$0-4$	$2$	$5$
$5-9$	$7$	$8$
$10-14$	$12$	$12$
$15-19$	$17$	$9$
$20-24$	$22$	$4$
$25-29$	$27$	$0$