A histogram is a graphical display of tabulated frequencies. It shows what proportion of cases fall into each of several categories. There is a difference between a histogram and a bar chart in the sense that it is the area of the bar that dictates the value, not the height, which is a very important difference particularly when the variables are not all the same width. The histogram above show the different employee's salaries.
http://www.whizdog.com/qmblog/images/histogram_032005_5927_image001.gif
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