The mean marks out of 100 of boys and girls in an examination are 70 and 73 respectively If the mean...

Question

The mean marks out of 100 of boys and girls in an examination are 70 and 73 respectively If the mean marks of all the students in that examination is 71 find the ratio of the number of boys to the number of girls

Accepted Answer

Consider x 1 as the ratio of number of boys to the number of girls So we get Sum of marks of boys 70x Sum of marks of girls 73 1 73 We know that Sum of marks of boys and girls 71 x 1 It can be written as 70x 73 71 x 1 On further calculation 7x 73 71x 71 So we get x 2 Therefore the ratio of the number of boys to the number of girls is 2 1

RS Aggarwal Solutions Class 9 Mathematics Solutions for Mean Median And Mode Of Ungrouped Data Exercise 18A in Chapter 18 - Mean Median And Mode Of Ungrouped Data