## Adjustable Spinner

Change the number of sectors and increase or decrease their size to create any type of spinner. Then, conduct a probability experiment by spinning the spinner many times. How does the experimental probability compare with the theoretical probability?

Click the **+1** and **-1** buttons to change the number of sectors. Next to the names of the colors, adjust the sliders or enter values into the percent boxes to change the size of the sectors.

To run an experiment, enter a number in the "Number of Spins" box. Then click **Spin**. The experimental and theoretical probabilities will be shown in the table at the bottom. Hit the **Spin** button repeatedly to get more trials.

Click **Show Results Frame** to see a pie graph of the results. (It is interesting to leave the Results Frame open as you continue to spin the spinner. The pie graph is automatically updated with each spin.)

To start over, click **New Experiment**.

Create a spinner of your choosing. Add or delete sectors, change their sizes and colors, go wild.

Make sure the Number of Spins is 1, and click the **Spin** button.

- How does the experimental probability compare to the theoretical probability?
- Click the
**Spin**button a few more times. What happens?

Change the Number of Spins to 100, and click the **Spin** button.

- How do the experimental and theoretical probabilities now compare?
- Hit the
**Spin**button a few more times. What happens? - What would you expect to happen if you hit the button many times?

Increase the Number of Spins to a very large number (the maximum allowed is 99,999).

- Hit the
**Spin**button one or more times? - Now compare the theoretical and experimental probabilities. What do you notice?
- Was your prediction correct?