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SSC Sample Paper Mock Test-14 SSC CGL Tear-II Paper-1

  • question_answer
    The arithmetic mean of the scores of a group students in a test was 52. The brightest 20% of them secured a mean score of 80 and the dullest 25 mean score of 31. The mean score of remaining 55% is

    A) 45%

    B)  50%

    C)  51.4% (approx.)

    D)  54.6% (approx.)

    Correct Answer: C

    Solution :

    Let mean score of remaining 55% = x \[52=\frac{20\times 80+25\times 31+55\times x}{100}\] \[\Rightarrow \]   \[5200=1600+775+55x\] \[\Rightarrow \]   \[55x=5200-1600-775=2825\] \[\therefore \]      \[x=\frac{2825}{55}=51.36=51.4%\](approx.)


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