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9th Class Mathematics Statistics Question Bank Statistics

  • question_answer
    Mean of five numbers is 27. If one of the numbers is excluded, the mean becomes 25. The excluded number is

    A)  25                              

    B)  27

    C)  135                            

    D)  35

    Correct Answer: D

    Solution :

         Sum of 5 numbers\[=27\times 5=135\] Mean of remaining 4 numbers\[=25\] \[\therefore \]Sum of remaining 4 numbers\[=4\times 25=100\] \[\therefore \]Excluded number\[=135-100=35\]


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