Statistical Applets

Probability - Spinning A Roulette Wheel

The American roulette wheel has 38 numbered slots: 1 through 36, 0, and 00. If the wheel is fair, the ball will be equally likely to end up in any slot.

In this applet, you can study the behavior of the wheel through a small number of spins, as well as a large number. You can also investigate the probability of certain sets of outcomes (events); does the empirical evidence from the wheel agree with the theoretical model that says:

Select an event (set of outcomes) of interest and a number of spins on the wheel. The outcome of each spin will be displayed as a bar graph of individual results and as a proportion of times the event of interest occurred. Check the box to show the true probability of the event. Click RESET at any time to start over.