Probability with Lego

You can use Lego and beads for an easy lesson on probability and statistics. It's visually intuitive.

You make a Lego board with pegs. Drop beads down.

Each bead has a 50-50 chance of going left or right. At the bottom, beads line up in stacks in the shape of a "binomial" probability distribution.

It's like flipping a coin for each row recording the result, and repeating that 100 times. The result usually is a nearly bell-shaped curve, where the 50/50 outcome is most common, represented by the middle stack of beads. The left stacks were beads that fell left more often, and the right stacks more often fell right, but in the same probability curve you'd see if you computed results, or recorded repeated coin flip experiments.

We made the pegged board out of Lego. It's modeled after what's called a "Galton Board." Have fun designing your own Lego Galton board.

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