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    Question

    The average age of a group of 20 persons is found

    to be 30 years. Later it is found that age of two of the persons is calculated as 32 and 64 instead of 87 and 9. Find the correct average age of the group.
    A 20 years Correct Answer Incorrect Answer
    B 28 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 = {(20 × 30) – 32 – 64 + 87 + 9}/20 = 30 years

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