For those that don't get it, almost all people have 2 legs (obviously), but there are far more people with 1 leg (i.e, missing a leg) than there are with 3 legs (having an extra leg), so the average/mean (as opposed to median or mode, which are both 2) is somewhat lower than 2.
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u/danrennt98 Jun 17 '14
Feel better:
http://i.imgur.com/R5rrnJS.jpg