The bar chart below represents a histogram of the number of hours Americans work a day. A histogram is a bar chart where the height of each bar is proportional to the frequency of a variable at a certain value. For example, of Americans that worked, 13% worked 8 hours a day and 95% worked 12 hours or less. The sum of all the frequencies adds up to a 100%.
This bar chart/histogram was built using Aploris on a Mac with OS X.