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A histogram is a lot more than a bar chart! In a histogram, the area of the bar, NOT its height, is proportional to frequency. Bars do not have to be of equal width. The height of each bar is called the frequency density.
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Glossary

frequency

Of a function: the rate of repetition of a periodic function.
In statistics: the number of occurances of a value

histogram

A statistical diagram for continuous data similar to a bar chart but where the area of each bar is proportional to the frequency.

Full Glossary List