Galton Board

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Galton Board

Galton’s Board, named after the English psychometrician Sir Francis Galton (1822-1911), is also called a quincunx or bean machine. It is a manually made board consisting of a funnel at the top which drops a number of balls onto a number of rows of pins followed by a number of containers in which the balls would fall into. Balls would be released from the funnel at the top of the board, have a 50-50 chance of going one way or another every time they would hit a pin, and eventually fall into their respective containers. The probability that a ball would end up in an outer container is very small. Thus, we see a tendency for the balls to go towards the center and create what’s called a normal distribution, or bell-shaped curve.
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