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JEE Main & Advanced Mathematics Statistics Question Bank Self Evaluation Test - Statistics

  • question_answer
    The mean of 13 observations is 14. If the mean of the first 7 observations is 12. And that of the least 7 observations is 16, what is the value of the 7th observations?

    A) 12

    B) 13

    C) 14

    D) 15

    Correct Answer: C

    Solution :

    [c] Total sum of 13 observations \[=14\times 13=182\] Sum of 14 observation \[=7\times 12+7\times 16\] \[=84\times 112=196\] So, the 7th observation \[=196-182=14\]


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