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9th Class Mathematics Statistics Question Bank Statistics

  • question_answer
    The mean of three numbers a, b and c is 8 and the mean of five number a, b, c, d and e is 15. The mean of 'd' and 'e' is

    A)  25   

    B)  25.5

    C)  75                              

    D)  51

    Correct Answer: A

    Solution :

         \[a+b+c=3\times 8=24\] \[a+b+c+d+e=5\times 15=75\] \[\Rightarrow \]\[24+d+e=75\] \[\Rightarrow \]\[d+e=75-24=51\] Thus, mean of \['d'\] and \['e'=\frac{d+e}{2}=\frac{51}{2}=25.5\]                      


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