Histogram

http://mindprod.com/jgloss/histogram.html

Above are two identical histograms represented first with actual people and then in a graphical representation.  A histogram displays a distribution of data in a graphical form.  These graphs represent height distribution among males and females ranging from 5  to 6'5'' feet.  The red shows female height and the blue males in the actual graph and in the picture females simply represents females and males males.