This is a box plot, box plots are used to quickly show the median and the quartiles of a set of data. In the example the median is between 60 and 80 and is approximately 75. Box plots can also be used to quickly calculate the inter-quartile range and to find any outliers (or discrepancies in the numbers).http://edubuzz.org/blogs/nbhs3x1/files/2007/01/boxplot-2.JPG
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