1.

The mean of marks secured by 60 students in division A of class X is 66, 45 students of division B is 62 and that of 75 students of division C is 60. Find the mean of marks of the students of three divisions of Class X.1). 61.82). 62.53). 61.14). 63.9

Answer»

TOTAL marks of division A = 60 × 66 = 3960

Total marks of division B = 45 × 62 = 2790

Total marks of division C = 75 × 60 = 4500

Total marks of all students = 3960 + 2790 + 4500 = 11250

Total number of students = 60 + 45 + 75 = 180

Average marks = 11250/180 = 62.5


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