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Maths

Representing data

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Bar charts

Use a bar chart 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, label the vertical axis 'Frequency'. The labelling of the horizontal axis depends on what is being represented by the bar chart.

Question

Leon conducts a survey to find the number of people in each of the cars arriving at his school gate between 8.30am and 9.00am. 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?

Answer

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 just a teacher or a sixth former.

Activity

Representing data activity

Fancy some pie? Try this activity.

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Spherox

Use your knowledge to help Spherox find his way home.

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