Source:
http://www.itl.nist.gov/div898/handbook/eda/section3/boxplot.htm
Box plots are used for two main purposes: to convey location of data and to convey the variation of data. This can be done by finding the mean of the data and plotting that value and its quartiles. This box plot is displaying different machines energy output. These plots are able to identify the overall mean, extreme points, or outliers, and the median.
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