This is a histogram map. This particular histogram is charting a group of workers and the amount of money the workers make in a day. The chart is easy to understand. I have seen this type of map used with charting test scores. At a glance you cannot only see the narrow specifics of $25 increments, but also see the broader views of where the bulk of the numbers are located on the chart.
The map was found at:
http://image.wistatutor.com/content/feed/tvcs/Histogram2520basic.GIF
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