Galton Box

The Galton box, is a device invented by Sir Francis Galton to demonstrate the central limit theorem, in particular that the normal distribution is approximate to the binomial distribution. The machine consists of a vertical board with interleaved rows of pins. Balls are dropped from the top, and bounce left and right as they hit the pins.

http://en.wikipedia.org/wiki/Bean_machine

Galton Box in Game Maker, source and executable

Galton Box in Turtle Blocks Source

Challenges:

• At the moment the balls have an equal chance of going left and right. What happens if you change it? Why?
• Change the number of rows. What happens? Why?
• What is the relationship between this and a similar experiment in coin tossing Turtle art , Game Maker ?