Where bar and column charts show individual values for each series, histograms group data together to show frequency distributions. In this example, we have 20 students and their exam marks.

Choosing the right graph is very important. Line graphs show how data changes over time or space. The x-axis shows time or distance. A line graph could be used to show the changes in a country's ...

Choosing the right graph is very important. A line graph could be used to show the changes in a country's employment structure over time. This graph shows that in the post-industrial era ...