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# Interpret bar graphs

Bar graphs (charts) are a type of graph that are used to display and compare the number, frequency or other measure for different discrete categories of data.

The x-axis represents the different categories and so has no scale. In order to emphasise the fact that the categories are discrete, a gap is left between the bars on the x-axis. The y-axis does have a scale and this indicates the units of measurement.

Mrs. Hall asked her students what kind of pet they have. How many students have a pet bird? 2 students have a pet bird.

The local newspaper keeps track of how many subscriptions are sold each month. Use the graph below to answer the questions. How many newspaper subscriptions were sold in July?

Solution: newspaper subscriptions