2. Questions Bank
  3. 9th Class
  4. Mathematics
  5. Statistics

9th Class Mathematics Statistics Question Bank Statistics

  • question_answer
    Value of 'a' if the mean mark is 1 of the following data, is

    A)  20                              

    B)  10

    C)  30                              

    D)  5

    Correct Answer: B

    Solution :

        \[\text{Mean}=\frac{(0\times a)+(1\times 4)+(2\times 3)+(3\times 2)+(4\times 1)}{a+4+3+2+1}\] \[1=\frac{4+6+6+4}{a+10}\] \[\Rightarrow \]            \[a+10=20\] \[\Rightarrow \]            \[a=10\]


You need to login to perform this action.
You will be redirected in 3 sec spinner