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Presentation of Data — Economics STD 11 Commerce — Question

CBSE BoardEnglish MediumSTD 11 CommerceEconomicsPresentation of Data3 Marks
Question
How does the procedure of drawing a histogram differ when class intervals are unequal in comparison to equal class intervals in a frequency table?
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Answer

A Histogram of equal class intervals has equal width of all rectangles indicating the same class intervals. In contrast, a Histogram of unequal class intervals has rectangles of varying width as per their corresponding class intervals. Before constructing a Histogram, frequencies of unequal class intervals are to be adjusted. The adjustment factor of each class is calculated with the following formula.
Adjustment factore for any class $=\frac{\text{Class Interval of the Concerned Class}}{\text{Lowest Class Interval}}$
And the adjusted frequency will be calculated by dividing the original frequency by adjustment factor.

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