http://mainland.cctt.org/mathsummer/josephbond/stemandplots/stem-and-leaf_std.htm
Stem and Leaf Plots are a statistical way of organizing data to make it easier to compare. They're constructed by having the first number of the data on the left, "stem" and the seond number to the right, the "leaf." this lines the data so you can see where it is more easily spread. The plot above is showing the infant mortality rates in Western Africa, for example there would be 51, and none in the range of 60-70 because they have no "leaf."
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