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    Question

    The average age of a group of 12 persons is found

    to be 20 years. Later it is found that age of two of the persons is calculated as 10 and 11 instead of 12 and 9. Find the correct average age of the group.
    A 20 years Correct Answer Incorrect Answer
    B 29 years Correct Answer Incorrect Answer
    C 30 years Correct Answer Incorrect Answer
    D 22 years Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Required average = {(12 × 20) – 10 – 11 + 12 + 9}/12 = 20 years

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