Question

The mean marks in statistics of 100 students in a class was 72.the mean marks in statistics of 70 boys was 75.find out the mean marks in statistics of girls in the class.

Answer 1

Answer:

please refer to the answer below

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