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Railways R.R.C. (Guwahati) Solved Paper Held on 24-11-2013

  • question_answer
    The average of 20 numbers is calculated as 20. It is discovered later on that while calculating the average, one number, namely 30 was wrongly read as 50. What is the correct average?

    A) 18                                

    B) 19

    C) 20                                

    D) 17

    Correct Answer: B

    Solution :

    Required correct average\[=\frac{20\times 20-50+30}{20}\] \[=\frac{400-20}{20}\] \[=19\]


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