http://www.cqeacademy.com/cqe-body-of-knowledge/continuous-improvement/quality-control-tools/histograms/
Description: A Histogram uses a graph to show a distribution of data. A main aspects that is unique for histograms is that is that a constant variable as opposed to the similar looking bar chart which uses different variables or categories. This graph conveys final scores for a group of students. The constant variable in this case is the scores the students received.
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