Multiple Choice Questions on The average of 13 observations is 68 among them an average of first 7 observation is 63 and that of ........... for CDS Exam Preparation

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Multiple Choice Questions

The average of 13 observations is 68 among them an average of first 7 observation is 63 and that of ...........

Quantitative Aptitude (CDS) Average
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    The average of 13 observations is 68 among them an average of first 7 observation is 63 and that of last 7 observation is 70. Find the value of the 7th observation?

    47

    Correct Answer

    56

    Incorrect Answer

    49

    Incorrect Answer

    51

    Incorrect Answer
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    Explanation:

    Number of observation = 13
    average of first 7 = 63 
    and average of last 7 = 70
    =7×63+7×70 - 68×13
    = 47

    By: bhavesh kumar singh
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