Question

In a percentage bar graph all bars are of height
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Answer 1

Answer:

yes all bars of hight

but not all hight of a bars are equally

Answer 2

In a bar-graph, the height of the bars represent the frequency of a particular category but it is counter-intuitive that in a histogram, instead of the height of the bar(which represents the frequency density), the area of the bar represents the frequency of the particular class.