Chlorpleth map is a very wide term that can be used to desribe a lot of different maps. Here we have a chloropleth map in five different classes. This is to say that the map represents five different ranges, each range being represented with a different color. The boundaries of these ranges are the state boundaries, which probably means that they took the average of the variable over the entire state. This can sometimes be misleading, due to the fact that the state may have vast variations of the given variable within its boundaries which would not be represented by this map.
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