Question

The class contains 50 students out of which 30 are girls the mean of marks scores by girls in the test is 73 and that of boys is 71 find the mean score of the whole class.

Answer 1

total no of student=50
girls(g)=30
then
boys(b)=50-30=20

according  to the q
g/30=75
     g =2250
b/20=71
       b=1420
then mean of marks of  full class=
(g+b)/50

=(2250+1420)/50
=3670/50
=73.40