Question

The mean marks in Bio-technology of 100 students in
a class was 76.5. The mean of marks of
boys was 75, while their number was 70.
Find the mean marks of girls in the class.​

Answer 1

mean =sum of total magks/total no. of students

so total marks = means×student=76.5×100

=7650

total no. of girl is 25

total marks of boys =75×70=5250

so marks of girl=7650-5250=2400

so means of girl =2400/25=96

so 96 is right answer