The difference of the highest and the lowest values in the data is called the ............

If the mean of the observations $x, x+3, x+5, x+7, x+10$ is $9,$ find the mean of the last three observations.

Heights (in $cm$) of $30$ girls of Class $IX$ are given below:
$140, 140, 160, 139, 153, 153, 146, 150, 148, 150, 152$
$146, 154, 150, 160, 148, 150, 148, 140, 148, 153, 138$
$152, 150, 148, 138, 152, 140, 146, 148$
Prepare a frequency distribution table for this data.

Let $m$ be the mid-point and $l$ be the upper class limit of a class in a continuous frequency distribution. The lower class limit of the class is:

The points scored by a basketball team in a series of matches are as follows:
$17, 2, 7, 27, 25, 5, 14, 18, 10, 24, 48, 10, 8, 7, 10, 28$
Find the median and mode for the data.

The following is the distribution of the number of employees working on different floors of the six-storey commercial complex:

Floor	$1$	$2$	$3$	$4$	$5$	$6$
Number of employees	$51$	$48$	$42$	$44$	$48$	$32$

Represent the information above by a bar graph.