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    Question

    The average of 8 numbers is 15. One number 21 is

    replaced by 9. Find the new average.
    A 13.5 Correct Answer Incorrect Answer
    B 12.5 Correct Answer Incorrect Answer
    C 21.3 Correct Answer Incorrect Answer
    D 33.3 Correct Answer Incorrect Answer

    Solution

    Original sum = 8*15 = 120 New sum = 120 − 21 + 9 = 108 New average = 108/8 = 13.5 Answer: 13.5

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