Question

The following table gives the weekly wages (in Rs.) of workers in a factory:

Weekly wages (in Rs.)	$50-55$	$55-60$	$60-65$	$65-70$	$70-75$	$75-80$	$80-85$	$85-90$
No. of workers	$5$	$20$	$10$	$10$	$9$	$6$	$12$	$8$

Calculate the number of workers getting weekly wages below $Rs.80$.

Answer 1

$Weeklywages$ $(inRs.)$	$No.ofworkers$
$50-55$	$5$
$55-60$	$20$
$60-65$	$10$
$65-70$	$10$
$70-75$	$9$
$75-80$	$6$
$Total$	$60$

We consider the class intervals till $75-80$ only as we are looking for the wages under $80$.

$\therefore$ The number of workers getting weekly wages below $Rs.80=60$

This is because $5+20+10+10+9+6$ adds up to $Rs60$