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.
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By: anil on 05 May 2019 02.11 am
Total marks secured by 60 students in division A = 60 $$ imes$$ 66 = 3960 Total marks secured by 45 students in division B = 45 $$ imes$$ 62 = 2790 Total marks secured by 75 students in division C = 75 $$ imes$$ 60 = 4500 => Mean of marks of the students of three divisions of Class X = $$frac{(3960 + 2790 + 4500)}{(60 + 45 + 75)}$$ = $$frac{11250}{180} = 62.5$$ => Ans - (B)
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