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Railways Sample Paper RRB (Group D) Sample Test Paper-1

  • question_answer
    The mean of 50 numbers is 30. Later it was discovered that two entries were wrongly entered as 82 and 13 instead of 28 and 31. Find the correct mean.

    A)  36.12  

    B)  30.66

    C)  29.28  

    D)  38.21

    Correct Answer: C

    Solution :

    [c] Required average \[=30+\frac{(28+31-82-13)}{50}\] \[=30+\left( -\frac{36}{50} \right)=30-\,0.72=29.28\]


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