The mean age of 40 students is 16 years and the mean age of another group of 60 students is 20 years. Find out the mean age of all the 100 students combined together.

The mean age of a combined group of men and women is 25 years. If the mean age of the group of men is 26 years and that of group that of women is 21 years, then find the percentage of men and women in the group.

Calculate the mean of the scores of 20 students in a mathematics test

The mean of marks obtained in an examination by a group of 100 students was found to be 49.96. The mean of the marks obtained in the same examination by another group of 200 students was 52.32, then the mean of the marks obtained by both the groups of students taken together is

Find the mean of the students for the following distribution

The mean weight of 120 students of a school is 52*75 kg. If the mean weight of 50 of them is 51 kg, find the mean weight of the remaining students.

The mean weight of 120 students of a school is 52*75 kg. If the mean weight of 50 of them is 51 kg, find the mean weight of the remaining students.

The sum of ages of father and his son is 75 years. If the age of the son is 25 years, find the age of the father.

The following table gives the ages of 50 students of a class. Find the arithmetic mean of their ages.

Find the mean age of 100 residents of a town from the following data.

The sum of the ages of father and his son is 45 years . 5 years ago the products of their ages was 124. Find the present ages .