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Statistics - Mean Correction

1 UPSC Prelims MCQs tagged "Statistics - Mean Correction". Free practice with answer keys, explanations, and timed mock tests on Anantam IAS.

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  1. The sum of 30 observations is 910. If one of the observations is taken…

    The sum of 30 observations is 910. If one of the observations is taken as -25 instead of 25, find the correct mean.

    1. A30
    2. B29
    3. C32
    4. D29.5
    Answer and explanation

    Correct answer: C

    The wrong sum is 910 because one value was recorded as -25 instead of +25, an error of 50. Adding the difference back gives the correct sum of 910 + 50 = 960. Dividing by 30 observations gives a correct mean of 960 / 30 = 32.

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    CSAT UPSC GPSC-2026 Easy