Histogram

http://libweb.surrey.ac.uk/library/skills/Number%20Skills%20Leicester/page_50.htm
A histogram is a graphic that shows the statistical distribution of a set of data.  These maps are usually used to show a frequency of some variable across intervals. The map above shows the frequency of participating in sports or exercise across the different age intervals.  This histogram clearly shows that as age increases, participating in sports or exercise decreases.