A bhistogram/b can be used to represent grouped continuous data.

The barea/b of each bar is proportional to the frequency in each class, which can lead to uneven widths of bars representing unequal class intervals.

The \y-axis is labelled bfrequency density/b.

\text{frequency density} × \text{class width} = \text{frequency}

[b]uHistograms[/u]/b

\text{frequency density} × \text{class width} = \text{frequency}