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10th Class Mathematics Statistics Question Bank Statistics

  • question_answer
    The A.M. of a set of 100 numbers is 43. If two numbers of the set, namely 65 and 35 are discarded, find the mean of the remaining observations.

    A)  42.86       

    B)  39            

    C)  43.67              

    D)  40

    Correct Answer: A

    Solution :

    (a): Sum \[=100\times 43=4300\] New sum of 98 numbers = 4300 ? 65 ? 35 = 4200 \[\therefore \] New mean (AM)? \[=\frac{4200}{98}=42.86\]                      


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