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9th Class Mathematics Statistics Question Bank Statistics

  • question_answer
    The mean of 2, 7, 6 and 'a' is 5 and mean of 18, 1, 6, a and b is 10. The value of b is

    A)  20                              

    B)  5

    C)  10                              

    D)  30

    Correct Answer: A

    Solution :

         \[2+7+6+a=4\times 5\] \[\Rightarrow \] \[a=20-15=5\] Now, \[18+1+6+5+b=5\times 10=50\] \[\Rightarrow \]\[b=50-30=20\]


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