The mean of marks secured by 45 students in division A of class X is 56, 40 students of division B is 52 and that of 40 students of division C is 50. Find the mean of marks of the students of three divisions of Class X. ?->(Show Answer!)

1. The mean of marks secured by 45 students in division A of class X is 56, 40 students of division B is 52 and that of 40 students of division C is 50. Find the mean of marks of the students of three divisions of Class X.

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By: anil on 05 May 2019 02.15 am

Total marks secured by 45 students in division A = 45 $$ imes$$ 56 = 2520
Total marks secured by 40 students in division B = 40 $$ imes$$ 52 = 2080 Total marks secured by 40 students in division C = 40 $$ imes$$ 50 = 2000 => Mean of marks of the students of three divisions of Class X = $$frac{(2520 + 2080 + 2000)}{(45 + 40 + 40)}$$ = $$frac{6600}{125} = 52.8$$ => Ans - (C)

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