Question

There are 40 Students in a class ,out of them 15 are boys.The mean of marks obtained by boys is 33 and that for girls is 35.Find out mean of all students in class.

Answer 1

girls = 40 - 15 = 25

sum of marks obtained by boys = 15 x 33 = 495

sum of marks obtained by girls = 25 x 35 = 875

total marks of a class = 495 + 875 = 1370

Mean of all students = 1370/40 = 34.25

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