Galton board
Device invented by Sir Francis Galton / From Wikipedia, the free encyclopedia
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The Galton board, also known as the Galton box or quincunx or bean machine, is a device invented by Sir Francis Galton[1] to demonstrate the central limit theorem, in particular that with sufficient sample size the binomial distribution approximates a normal distribution. Among its applications, it afforded insight into regression to the mean or "reversion to mediocrity".