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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?



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.
And the adjusted frequency will be calculated by dividing the original frequency by adjustment factor.

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