This type of graph is among the first of several items that were taught to me in elementary school. Numerical data is organized so that one can easily analyze the set’s distribution. Arthur Bowley first invented this in the early 1900s. This one was found on an academic website.
Where example was found: http://academic.kellogg.cc.mi.us/secristb/Math%20130%20Online/Course%20Notes/stem_leaf_graph1.gif
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