This type of graph is commonly used to show five number summaries. For those who do not know, five number summaries are: the minimum value of the set, the minimum value of the central 50%, the average, the maximum value of the central 50%, and the maximum value of the set. These are most often used to display population differences. This one shows annual snowfall at a ski resort.
Where example was found: http://edubuzz.org/blogs/nbhs3x1/files/2007/01/boxplot-2.JPG
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