1. The mean of marks secured by 35 students in division A of class X is 65, 45 students of division B is 61 and that of 70 students of division C is 59. What is the mean of marks of the students of three divisions of Class X?
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By: anil on 05 May 2019 02.13 am
Total marks secured by 35 students in division A = 35 $$ imes$$ 65 = 2275 Total marks secured by 45 students in division B = 45 $$ imes$$ 61 = 2745
Total marks secured by 70 students in division C = 70 $$ imes$$ 59 = 4130
=> Mean of marks of the students of three divisions of Class X = $$frac{(2275 + 2745 + 4130)}{(35 + 45 + 70)}$$ = $$frac{9150}{150} = 61$$ => Ans - (C)
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Total marks secured by 70 students in division C = 70 $$ imes$$ 59 = 4130
=> Mean of marks of the students of three divisions of Class X = $$frac{(2275 + 2745 + 4130)}{(35 + 45 + 70)}$$ = $$frac{9150}{150} = 61$$ => Ans - (C)