## 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?

**This interactive is optimized for your desktop and tablet.**

### Features

- Click the and buttons to change the number of sectors.
- Adjust the sliders to change the size of the sectors.
- Change the name of each sector by clicking on the text, under the column, "Color."
- Click the
**Pie Chart**button to see a experimental graph. (It is interesting to leave this open as you continue to spin the spinner. The pie graph is automatically updated with each spin.)

### How to Use

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. Hit the **Spin** button repeatedly to get more trials, or hit **Skip to End**, after hitting the spin button once, if you would like for all the spins to generate.

To start over, click **Reset**.

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?