Follow up Nerddom!
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Clarification for non-math aficionados: the above two illistrations are refering to the Gauss function or in the special case, the symmetrical (famous?) Bell Curve. It is a continuous function which approximates the distribution of statistical events. In simple terms with example of the Bell Curve ("you are here" Tshirt): middle of chart = high probability the event will occur; two sides of chart: low probability the event will occur.
To endanger explaining the jokes too thoroughly and therefore ruining them: the Bell Curve exemplifies people and population. The "you are here" point refers to being a (math-) geek - low probability and low portion of total population.
Some Reading:
http://hyperphysics.phy-astr.gsu.edu/hbase/math/gaufcn.html
http://mathworld.wolfram.com/GaussianFunction.html
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Alright, that'll be all for now