The mean of the observations $x+5$,$x+3$,$x+11$,and $x+1$ is ..........

Draw a histogram for the data given below:

Class	$0-6$	$6-12$	$12-18$	$18-24$	$24-30$	$30-36$
Frequency	$7$	$10$	$12$	$15$	$10$	$6$

The mean of $3, -3, -3, 3, 3, -3$ is ..........

The mean of the $10$ observations is $68$. If each observation is divided by $2$ and then $6$ is added to each result, find the mean of the new observations so obtained.

The marks obtained (out of $50$ marks) by $30$ students in a mathematics test are as given below:
$37, 22, 35, 42, 10, 16, 31, 22, 20, 27$
$27, 20, 31, 40, 35, 40, 27, 16, 47, 22$
$40, 22, 35, 20, 37, 20, 37, 47, 42, 31$
Represent this data in a frequency distribution table.

The range of the observations: $7, 9, 7, 5, 6, 6, 9, 18, 8, 8, 6$ is ..........