New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    The average of 10 observations is 60. It was realized

    later that an observation was misread as 39 in place of 93. The correct average is:
    A 60 Correct Answer Incorrect Answer
    B 65.4 Correct Answer Incorrect Answer
    C 62 Correct Answer Incorrect Answer
    D 64.5 Correct Answer Incorrect Answer

    Solution

    The average of 10 observations = 60 Total of 10 observations = 60×10 = 600 Misread number = 39, right number = 93 By mistake difference in number = 93-39= 54 Now a correct total of 10 observations = 600+54= 654 Average = 654/10  = 65.4

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