“Imagine a pie chart that shows Visuals at 42 percent, Numbers at 36 percent, Stupid Jokes at 15 percent and Random Complaints at 7 percent. Now let’s convert that to a bar chart.” ...

Both axes are always labelled, so you know what is being shown. Look at this bar chart. Can you see that Omi read 5 more books than Sally during the summer holiday? Why not see how much you know ...