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SSC SSC CHSL TIER-I Solved Paper Held on 10.01.2017

  • question_answer
    The mean of marks secured by 55 students in division - A of class X is 55 that of 45 students of division - B is 51 and that of 40 students of division - C is 49. What is the mean of marks of the students of three divisions of class X?

    A)  51.3                            

    B)  50.6

    C)  52                               

    D)  53.4

    Correct Answer: C

    Solution :

     Required average \[=\frac{55\times 55+45\times 51+40\times 49}{55+45+40}\] \[=\frac{3025+2295+1960}{140}\] \[=\frac{7280}{140}=52\]


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