frequency diagram

A frequency diagram is used to display grouped continuous data.

This type of diagram is similar to a bar chart. The main difference between them is that there are no gaps between the bars.

It has an equal class interval.

Let’s use the information below as a starting point.

The height of 30 students in an English lesson were measured. The results were grouped in a frequency table.

A frequency diagram was then drawn to show this data.

The horizontal axis shows the type of data collected, and the vertical axis shows the frequency – the number of people in each interval.