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10th Class Mathematics Statistics Question Bank Statistics and Probability

  • question_answer
    The numbers 4, 6 and 8 are the frequencies (x + 2), x and (x - 1) and if their arithmetic mean is 8, the value of x is

    A)  7                                            

    B)  6

    C)  9                                            

    D)  8  

    Correct Answer: D

    Solution :

     \[8=\frac{4\times (x+2)+6x+8\times (x-1)}{4+6+8}\] \[=\frac{4x+8+6x+8x-8}{18}\] \[\therefore \]  \[x=8\]


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