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9th Class Mathematics Statistics Question Bank Statistics

  • question_answer
    The mean, median and mode of four numbers is 8. The smallest number is 7. The numbers are

    A)  7, 7, 8, 8                    

    B)  7, 8, 8, 8

    C)  7, 8, 8, 9       

    D)  8, 8, 8, 8

    Correct Answer: C

    Solution :

         Since mode of four numbers is 8 therefore 8 occurs at least two times and 7 is one of them. So, three observations are 7, 8, 8 Now, Let fourth observations be\[x.\] \[\therefore \]\[7+8+8+x=4\times 8\] \[\Rightarrow \]\[x=32-23=9\]           


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