1. The mean of marks secured by 30 students in division-A of class X is 67, 55 students of division-B is 63 and that of 40 students of division-C is 61. 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 02.17 am
Total marks secured by 35 students in division A = 30 $$ imes$$ 67 = 2010 Total marks secured by 45 students in division B = 55 $$ imes$$ 63 = 3465 Total marks secured by 70 students in division C = 40 $$ imes$$ 61 = 2440 => Mean of marks of the students of three divisions of Class X = $$frac{(2010 + 3465 + 2440)}{(30 + 55 + 40)}$$ = $$frac{7915}{125} = 63.32$$
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