source: http://www.dreamcalc.com/dchelp/userguide_graphing_sd_charts.htm
Histograms depict the frequencies of statistical values in graphical form. On the horizontal axis, the statistical data is displayed in consecutive, even intervals. On the vertical axis values are displayed to show the frequency of observation of the horizontal data points. Rectangular bars corresponding with their respective categories demonstrate the frequency with their height. The total area of the bars combined is equal to the total data present in the dataset.
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