The frequency table of the ages of 40 students in a class is given below. Find their mean age.

Observe the given frequency table and write the answers to the following questions.

(1) About how many families does the table give data?

(2) How many families have 3 members?

(3) How many families have 5 members?

(4) How many families have the maximum number of members?

(5) How many families have less than 4 members?

The blood groups of the persons who had donated blood at blood donation camp are as follows.

Use this information to complete the table below.

(1) Which blood group has the smallest number of donors?

(2) Which blood group has the most donors?

(3) How many donors are of the ‘B’ blood group?

(4) What was the total number of donors at the camp?

The record of daily rainfall (in centimetres) in Walwa village in the first 15 days of September is given below.

2.5, 1.5, 4.0, 3.0, 0.5, 5.0, 5.5, 4.0, 2.5, 3.5, 6.0, 0.5, 0.5, 4.5, 1.5.

Find the mean rainfall for these 15 days.

The money earned (in rupees) by each of the 40 scouts in the Khari Kamai project is given below.

Make a frequency table for this data and find the mean.