Histograms allow for a visual representation of a data set. Frequencies, kind of like the classes in a choropleth map, allow us to see the probability that something will occur in a given data see. The thing to be measure lays on the x axis, while the frequencies can be seen on the y axis. These types of visualizations are handy when doing things like surveys and when we want to make sure a test is "fair", it'll have the "bell curve" shape on its histogram.
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