Department of Psychology
Several folks out there in WWW land have posted electronic versions of Galton's probability machine. Check these out. Think about the relationship between the binomial distribution and the normal distribution. You could probably find more Quincunx demonstrations on the web using a search engine, but these few should give you the idea.
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Dr. Karl L. Wuensch
This page most recently revised on the 29th of October, 2011.