The class mark of the class $70-90$ is ...........

The expenditure of a family on different heads in a month is given below:

Head	Expenditure (in $Rs$)
Food	$4000$
Education	$2500$
Clothing	$1000$
House Rent	$3500$
Others	$2500$
Savings	$1500$

Draw a bar graph to represent the data above.

Find the number of observations,if the sum of some observations is $975$ and their mean is $32.5$.

The following table gives the distribution of students of sections $A$ and $B$ of a class according to the marks obtained by them.

Marks	Section $A$ Frequency	Section $B$ Frequency
$0-15$	$3$	$3$
$15-30$	$12$	$16$
$30-45$	$28$	$25$
$45-60$	$30$	$27$
$60-75$	$35$	$40$
$75-90$	$13$	$10$

Represent the marks of the students of both the sections on the same graph by two frequency polygons. What do you observe?

Median of the following numbers: $4, 4, 5, 7, 6, 7, 7, 12, 3$ is

$A$ total of $25$ patients admitted to a hospital are tested for blood sugar levels $(mg/dl)$ and the results obtained are as follows:
$\begin{array}{lllll} 87 & 71 & 83 & 67 & 85 \\ 77 & 69 & 76 & 65 & 85 \\ 85 & 54 & 70 & 68 & 80 \\ 73 & 78 & 68 & 85 & 73 \\ 81 & 78 & 81 & 77 & 75 \end{array}$
Find the mean,median,and mode $(mg/dl)$ of the above data.