The map shown above is a Stem and Leaf Plot. The number on the left side of the divider line is known as the "Stem" while the number on the right is called the "Leaf". Each stem is displayed only once, while the leaf my be listed numerous times depending on the information provided. These plots are generally used to display items such as test scores or age, and are especially useful because it gives the viewer a quick representation of the distribution and density of the data.
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