Box Plot

Box plots are useful for understanding data in terms of median and other statistical data types. In these types of plots you can begin to understand all the data. It allows you to see the distribution of the data. They are especially useful when seeing if there are any outliers.

http://edubuzz.org/blogs/nbhs3x1/2007/01/08/8-jan-2007-five-figure-summary-and-box-plots/