How to Make a Galton Board

DIY, Statistics

The bean machine, also known as the Galton Board or quincunx, is a device invented by Sir Francis Galton to demonstrate the central limit theorem, in particular, that with sufficient sample size the binomial distribution approximates a normal distribution. [Wikipedia]

Ingredients:

STEP 1

DIY Galton Board 1 — Gather your materials.

STEP 2

DIY Galton Board 2 — Glue the printable to one side of the corkboard. Then, trim the paper to the corkboard. You can download the printable here.

STEP 3

DIY Galton Board 3 — Push a pin into every dot. You may need a grown-up to assist you.

STEP 4:

DIY Galton Board 4 — Glue a popsicle stick on top of every line, using beads to help evenly space the popsicle sticks. Let them dry for at least ½ hour.

STEP 5:

DIY Galton Board 5 — Cut 2” of the straw and glue it along the top of the corkboard centered above the first row of pins.

STEP 6:

DIY Galton Board 6 — Lean the corkboard up against a wall and drop some beads down the straw. The more beads you drop, the better!

Author

Ali Kaya

This is Ali. Bespectacled and mustachioed father, math blogger, and soccer player. I also do consult for global math and science startups.

DIY Details

Source

Avg. Duration

1 hour

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