A diagram consisting of rectangles whose area is proportional to the frequency of a variable and whose width is equal to the class interval is a histogram. The rectangles are typically different colors to indicate the different categories, but can also just be labeled. This example of a histogram shows the final exam scores of a certain population of students. The number of students is depicted on the Y axis of the diagram and the possible final exam scores are depicted on the X axis. As you can see, most students scored in the 60-80 range.
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