A histogram is useful to see how different groups interact with one variable. In this graph they are looking at what percentage of smokers are in each age group. This is divided between age and sex. For the female group the most smokers are between the ages of 25 and 34, and most smokers are under 65. In the male group most smokers are between the ages of 25 and 44, and again most smokers are under 65.http://math.youngzones.org/stat_graph.html
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