Question

Marks of $30$ students in mathematics test are given in the adjacent grouped frequency distribution.

Sl. No	Marks	No of students
$1$	$0-5$	$5$
$2$	$5-10$	$7$
$3$	$10-15$	$10$
$4$	$15-20$	$6$
$5$	$20-25$	$2$

Into how many groups the data is classified

Answer 1

$\Rightarrow$ The first column here represents the marks obtained in class interval form. The lowest number in a class interval is called the lower limit and the highest number is called the upper limit. This example is a case of continuous class intervals as the upper limit of one class is the lower limit of the following class.

$\Rightarrow$ In given table we can see $30$ students are classified in $5$ groups according to their marks.

$\Rightarrow$ Five groups are $0-5,5-10,10-15,15-20$ and $20-25$