Note that, class intervals have varying base widths. This changes how we generally draw a histogram.
There is a need to find length of rectangles for each class interval because length of rectangle will determine y-axis now, while class interval will be represented on the x-axis.
Length of the rectangle is given by,
Where C = minimum class width of the data set.
Here, note from the table below that C = 10.
Thus, histogram can be drawn following the given table. Table makes our observation and calculation clearer and ensures accuracy of the final answer.
The histogram is as follows:
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