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

    Question

    The mean of 50 observations was calculated as 75. It was

    later found that one of the observations was misread as 173 instead of 113. The correct mean is
    A 76.6 Correct Answer Incorrect Answer
    B 76.2 Correct Answer Incorrect Answer
    C 75.4 Correct Answer Incorrect Answer
    D 73.8 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Difference = 173 – 113 = 60 Decrease in average = 60/50 = 1.2 Correct mean = 75 – 1.2 = 73.8

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