A bar chart, like a frequency diagram, shows the frequency of events occurring. The height of the bar is the frequency.
A simple bar chart may look like this.
Bar charts may be needed to compare data.
The following frequency table shows information for the numbers of pets owned by a class.
|0 pets||1 pet||2 pets||3 or more pets|
A composite bar chart can show this information. A key that shows which bar represents which data is necessary to be able to read the bar chart properly.