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11th Class Mathematics Sample Paper Mathematics Olympiad - Sample Paper-3

  • question_answer
    A group of 10 items has A.M 6, if the arithmetic mean of 4 of these items Is 7.5 the of the remaining items is:

    A)  5                   

    B)  3               

    C)  3.5                              

    D)  4.5

    Correct Answer: A

    Solution :

    [a] \[\because \]Sum of 10 item \[=6\times 10=60\]             Sum of 4 item \[=4\times 7.5=30.0\] Sum of remining 6 items \[=60-30=30.\] Mean of remaining 6 items \[=\frac{30}{6}=5\]


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