## Physlet-Based Pre Lab 1

The simulation above represents 20 marbles dropped 5 at a time onto a board with pegs, a**
Galton** board. You are attempting to find the postion at which the balls are released
but you can only measure the average distance of the balls after they have made it though the pegs.
Each time the marble hits a peg it has an equal chance of bouncing to the left or to the right. At
any time you can measure the mean, i.e. average, value of the position of the marbles that have made
it through the pegs. The simulation will stop after all 20 marbles have landed but you may
repeat the experiment as many times as you wish.

- How is this simulation related to the experiment you about to perform?
- Do you always obtain the same value for the mean after all 20 marbles have landed?
- What do you think is the true mean value of the position of the marbles that have made it
though all the pegs?

Want to read more about the Normal Distribution?

Galton board used with permission of the author, David
Krider.