....... is a branch of Mathematics in which the extraction of meaningful information is studied.

The lengths of $62$ leaves of a plant are measured in millimetres and the data is represented in the following table:

Length (in mm)	Number of leaves
$118-126$	$8$
$127-135$	$10$
$136-144$	$12$
$145-153$	$17$
$154-162$	$7$
$163-171$	$5$
$172-180$	$3$

Draw a histogram to represent the data above.

Represent the following data by means of a histogram:

Class	$0-5$	$5-10$	$10-20$	$20-30$	$30-50$	$50-70$
Frequency	$5$	$7$	$12$	$16$	$24$	$16$

If each observation of the data is increased by $5,$ then their mean

The facts or figures,which are numerical or otherwise,collected with a definite purpose are called .......

Draw a histogram for the following frequency distribution with unequal class length:

Class	$0-5$	$5-10$	$10-20$	$20-30$	$30-50$	$50-70$	$70-100$
Frequency	$6$	$8$	$14$	$16$	$24$	$20$	$30$