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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