Like it was being said in the last map, when dealing with numeric data, there's two main ways of presenting it: colors (Cholorpleth Map) or symbol (Proportional Symbol Map).
However, maps get more interesting when they're presenting not only one variable, but two that may be related with each other. In that way, the analysis is much richer, making it possible to recognize patterns and finding reasons for such distribution.
Thus, the use of this both techniques together is one of the easiest ways to make this presentation. Also, since it's common, it's easier for the reader to understand it.
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