Bar charts

A bar chart is used to compare two or more values with a small set of results.

Drawing a bar chart

In a bar chart, the height of the bar shows the frequency of the result.

As the height of bar represents frequency, the vertical axis would be labelled 'Frequency'. The labelling of the horizontal axis depends on what is being represented by the bar chart. Take care to ensure an appropriate scale, to number the axes uniformly, and give the appropriate label on the axes. Finally remember to give the graph a suitable title.


Leon conducts a survey to find the number of people in each of the cars arriving at the school gate between {8.30}am and {9.00}am. His results are shown in the bar chart below:

Bar chart

a) How many cars contained {1} person?

b) How many cars contained more than {3} people?

c) Why there are only a small number of cars containing {1} person?

d) How many cars arrived at the school gate between {8.30}am and {9.00}am?

a) {8} cars contained {1} person

b) {14} cars contained more than {3} people (10 + 4 = 14)

c) Most cars would be driven by parents bringing their children to school - only a few would contain one person (such as a teacher or a sixth former).

d) {64} cars ( {8+20+22+10+4}).