Question

Weekly wages of $250$ workers in a factory are given in the following table. Construct the histogram and frequency polygon on the same graph for the data given.

Weekly wages	$500-550$	$550-600$	$600-650$	$650-700$	$700-750$	$750-800$
No of workers	$30$	$42$	$50$	$55$	$45$	$28$

Answer 1

$Class-interval$	$Frequency$	$Class-mark$
$450-500$	$0$	$475$
$500-550$	$30$	$525$
$550-600$	$42$	$575$
$600-650$	$50$	$625$
$650-700$	$55$	$675$
$700-750$	$45$	$725$
$750-800$	$28$	$775$
$800-850$	$0$	$825$

$\Rightarrow$ Co-ordinates of frequency polygon are $(475,0),(525,30),(575,42),(625,50),(675,55),(725,45),(775,28)$ and $(825,0)$.

$\Rightarrow$ Above graph shows histogram and frequency of polygon.