Multiple Choice Questions on A student was asked to find the arithmetic mean of the numbers 3 11 7 9 15 13 8 19 17 21 14 and x He........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

A student was asked to find the arithmetic mean of the numbers 3 11 7 9 15 13 8 19 17 21 14 and x He...........

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    A student was asked to find the arithmetic mean of the numbers 3, 11, 7, 9, 15, 13, 8, 19, 17, 21, 14 and x. He found the mean to be 12. What should be the number in place of x ?

    5

    Incorrect Answer

    7

    Correct Answer

    9

    Incorrect Answer

    11

    Incorrect Answer
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    Explanation:

    Clearly, we have (3 + 11 + 7 + 9 + 15 + 13 + 8 + 19 + 17 + 21 + 14 + x) / 12 = 12.
    or  137 + x = 144 or x = 144 - 137 = 7.

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