1. The mean of marks secured by 60 students in division A of class X is 64, 40 students of division B is 60 and that of 60 students of division C is 58. Find the mean of marks of the students of three divisions of Class X.
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By: anil on 05 May 2019 02.08 am
Total marks secured by 60 students in division A = 60 $$ imes$$ 64 = 3840 Total marks secured by 40 students in division B = 40 $$ imes$$ 60 = 2400 Total marks secured by 60 students in division C = 60 $$ imes$$ 58 = 3480 => Mean of marks of the students of three divisions of Class X = $$frac{(3840 + 2400 + 3480)}{(60 + 40 + 60)}$$ = $$frac{9720}{160} = 60.75$$ => Ans - (D)
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