Galton Board - Normal Distribution

I use this to teach central tendencies and normal distribution in my AP Biology class. There is a brass or golden colored beed out of the 600 steel beads that you can follow in each turn. I shot this in low light because that was the only way to view the the golden beed.

[@annamanenivaasudevanathchoudar]

as someone who doesn't know why this happens this was very satisfying to watch and hear

[@MrGrodskiChemistry]

There are 600 steel beads that fall through the system of geometric shapes through one opening. The beads have a 50 - 50 chance of going left or right every time they fall through the geometric shapes. There is a greater probability that they will fall in the middle then outward on the sides because there is greater chance that the beads will go move left as much as they will move to the right after many trips through the shapes. What are the chances that the beads will move only to the left or only to the right as they progress through the shapes if there is 50 - 50 chance of moving left or right each time? It would be very small and that is why the number of beads decreases outward from the middle. This is a great demonstration of a normal distribution.

[@annamanenivaasudevanathchoudar]

thanks!