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- The data is grouped into specific ranges of values known as intervals.
- All intervals in a histogram must be the same size.
- Interval data is marked in groups along the horizontal axis.
- The histogram is the collection of rectangles drawn above the intervals.
- The height of each rectangles is proportional to the frequency of the data in the corresponding interval.

A histogram looks similar to a bar graph, but in a histogram there are numbers on the horizontal axis and the bars cannot have a space between each other, since the data is continuous.