A histogram is a graphical display of tabulated frequencies. It shows you what proportion of cases fall into each of several categories. There is a difference between a histogram and a bar chart in the sense that it is the area of the bar that indicates the value, not the height, which is a huge difference when the variables aren't at the same width. This histogram above shows the distributions of jockeys.
http://images.google.com/imgres?imgurl=http://www.daisy2000.com/Daisy2003/HorizontalHistogram.gif&imgrefurl=http://lukesmaps.blogspot.com/2008_12_01_archive.html&usg=__agW_ci3rFiJu7i_tRlWK1PX7_hg=&h=600&w=600&sz=13&hl=en&start=5&um=1&itbs=1&tbnid=lFBZFa8ryv6pkM:&tbnh=135&tbnw=135&prev=/images%3Fq%3Dhistogram%26um%3D1%26hl%3Den%26client%3Dsafari%26sa%3DN%26rls%3Den%26tbs%3Disch:1
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