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SSC SSC CHSL TIER-I Solved Paper Held on 09.01.2017

  • question_answer
    The mean of marks secured by 30 students in division-A of class X is 67, that of 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?

    A)  63.32

    B)  62.62

    C)  61.92

    D)  64.72

    Correct Answer: A

    Solution :

     Required average \[=\frac{30\times 67+55\times 63+40\times 61}{30+55+40}\] \[=\frac{2010+3465+2440}{125}\] \[=\frac{7915}{125}=63.32\]


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