there are 100 student in a class 40 of them are girls the average marks of boys in science is 75%and that of the girls is 65% find the average marks of the class in science
rohitchhabra153:
what is formula of calculating average
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no of boys = 100-40 = 60
total marks of boys = 75 x 60 = 4500
total marks of girls = 65x 40= 2600
total marks of students
= 4500 + 2600
= 7100
average = 7100/100 = 71
total marks of boys = 75 x 60 = 4500
total marks of girls = 65x 40= 2600
total marks of students
= 4500 + 2600
= 7100
average = 7100/100 = 71
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