A class teacher has the following absentee record of $40$ students of a class for the whole term. Find the mean number of days a student was absent.

Number of days	$0-6$	$6-10$	$10-14$	$14-20$	$20-28$	$28-38$	$38-40$
Number of students	$11$	$10$	$7$	$4$	$4$	$3$	$1$

 

The following table gives the literacy rate (in percentage) of $35$ cities. Find the mean literacy rate in percentage.

The following is the cumulative frequency distribution (of less than type) of $1000$ persons each of age $20$ years and above. Determine the mean age.

If the means of the following frequency distribution is $18$, find the missing frequency.

If the sum of the frequencies is $120$ and the mean is $50$ then find the sum of missing frequencies.

The daily income of a sample of $50$ employees are tabulated as follows:

Find the mean daily income of employees. 

The following is the distribution of height of students of a certain dass in a certain city:

Find the median height.

Following is the distribution of I.Q. of $100$ students. Find the median I.Q.