Question

There are 100 student in a class 40 of them are girls. The average marks of the boys in science is 75% and that of girls is 65% find the average marks of the class in science.

Answer 1

total number of students = 100
number of girls =40
number of boys =100-40=60
average mark of boy in science =75%
let the maximum marks in science be 100
sum of total marks secured by boy 60*75=4500
average mark of girls =65%
sum of total mark secure by girl =40*65=2600
thus the average mark of class=4500+2600/100
the ans is =71%

Answer 2

Answer:

71

Step-by-step explanation:

Total marks of boys = 60 × 75 = 4500

Total marks of girls = 40 × 65 = 2600

Sum of total marks of the class = 4500 + 2600 = 7100

∴ Mean marks of the class in Science = 7100/100

                                                               = 71