Question

The mean of marks in Statistics of 100 students in a class was 72. The mean
of marks of boys was 75, while their number was 70. Find out the mean marks of
girls in the class.​

Answer 1

Step-by-step explanation:

The marks of the girls is

( 100×72)-(75×70)

=7200-5250=1950

The mean marks of the girls =1950/(100-70)

=1950/30=65

Answer 2

Answer:

The mean of marks in Statistics of 100 students in a class was 72. The mean

of marks of boys was 75, while their number was 70. Find out the mean marks of

girls in the class.