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Railways Sample Paper RRB (Group D) Sample Test Paper-5

  • question_answer
    A boy found that the average of 20 numbers is 3 5 when he writes a number '61' instead of'16'. The correct average of 20 number is

    A)  32.75  

    B)  37.25

    C)  34.75  

    D)  34.25

    Correct Answer: A

    Solution :

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


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