Galton board
Device invented by Francis Galton
Galton board
The Galton board, also known as the Galton box or quincunx or bean machine (or incorrectly Dalton board), is a device invented by Francis Galton to demonstrate the central limit theorem, in particular that with sufficient sample size the binomial distribution approximates a normal distribution. Galton designed it to illustrate his idea of regression to the mean, which he called "reversion to mediocrity" and made part of his eugenist ideology.
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