Multiple Choice Questions on The mean of 8 observations is 10 5 If seven of the observations are 3 15 7 19 12 17 and 8 find the e........... for RRB(NTPC) Exam Preparation

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Multiple Choice Questions

The mean of 8 observations is 10 5 If seven of the observations are 3 15 7 19 12 17 and 8 find the e...........

Quantitative Aptitude (RRB NTPC) Statistics
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    The mean of 8 observations is 10.5. If seven of the observations are 3, 15, 7, 19, 12, 17 and 8, find the eighth observation.

    10

    Incorrect Answer

    11

    Incorrect Answer

    3

    Correct Answer

    12

    Incorrect Answer
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    Explanation:
    Let the required number is ‘x’
    Then (3+15+7+19+12+17+8+x)/8=10.5
    81+x=84
    X=3

    By: Barka Mirza
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