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Railways Sample Paper RRB (Group D) Sample Test Paper-13

  • question_answer
    A boy found that the average of 20 numbers is 35 when he writes a number '61' instead of'16'. The correct average of 20 numbers is

    A)  32.75  

    B)  37.25

    C)  34.75  

    D)  34.25

    Correct Answer: A

    Solution :

    [c] Sum of 20 numbers = \[20\times 35=700\] Sum of 20 numbers when 61 is replace by 16 \[\Rightarrow 700-\,61+16\text{ }=655\] Correct average of 20 numbers =\[\frac{655}{20}=32.75\]


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