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Railways R.R.C. (Jabalpur) Solved Paper Held on 2nd Shift 9-11-2014

  • question_answer
    The mean value of 20 observations was found to be 75, but later on, it was detected that 97 was misread as 79. Find the correct mean?

    A) 75-7                             

    B) 75-8

    C) 75-6                             

    D) 75-9

    Correct Answer: D

    Solution :

    The correct mean\[=\]\[75+\frac{97-79}{20}\] \[=75+\frac{18}{20}\]                         \[=75+0.9\] \[=75.9\]


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