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9th Class Mathematics Statistics Question Bank Statistics

  • question_answer
    A grouped frequency distribution table with classes of equal sizes using 63 ? 72 (72 included) as one of the classes is constructed for the following data. Find the number of classes in the distribution.

    A)  9                                

    B)  11                  

    C)  10                  

    D)    12

    Correct Answer: B

    Solution :

    Given, Class interval \[63-72\](72 included) Class size (width) = 9 Maximum observation =112 Minimum observation = 14 \[\therefore \]No. of classes \[=\frac{\text{Max}-\text{Min}}{\text{width}}\] \[=\frac{112-14}{9}=\frac{98}{9}=10.8\cong 11\] Hence, the no. of classes in the distribution is 11.


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