A stem and leaf plot is a type of plot that helps organize data. It is comprised of two sections, the stem and the leaf. The steam column holds all numbers except the number in the ones place. The leaf column holds the number in the ones place. For example, if you had the number 927 the nine and two would be in the stem column and the seven would be in the leaf column. By organizing data into stem and leaf plots, identification of trends throughout the data can be easily seen. It also makes it simple to find the median and mode of the number set. The example stem and leaf plot pictured above shows a range of temperatures recorded over a period of time.
http://emed.nucenter.org/groups/dataprobability/blog/
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