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10th Class Mathematics Statistics Question Bank Statistics

  • question_answer
    The mean of six numbers is 21. If one number is excluded, then their mean is 19, the excluded number is ____.    

    A)  31                  

    B)         26                  

    C)  28                  

    D)         25                  

    Correct Answer: A

    Solution :

    Let the excluded number be x and the sum of rest of numbers be y. Then,  \[21=\frac{x+y}{6}\,\,\,\Rightarrow \,\,\,\,126=x+y\]          ...(i) Also,    \[19=\frac{y}{5}\,\,\Rightarrow \,\,\,y=95\] \[\therefore \]    From   (i)\[x=31\].


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