1. The mean of marks secured by 50 students in division A of class X is 61, 25 students of division B is 57 and that of 50 students of division C is 55. What will be 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 50 students in division A = 50 $$ imes$$ 61 = 3050 Total marks secured by 25 students in division B = 25 $$ imes$$ 57 = 1425 Total marks secured by 50 students in division C = 50 $$ imes$$ 55 = 2750 => Mean of marks of the students of three divisions of Class X = $$frac{(3050 + 1425 + 2750)}{(50 + 25 + 50)}$$ = $$frac{7225}{125} = 57.8$$ => Ans - (D)
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