# TI-83 Instructions

## Computing the Mean and the Median

• Enter the data into list `L1`, or whatever list you like.

### Method 1 (Mean and Median)

1. Press `STAT`. The `Stat` menu bar appears. The `EDIT` menu title is highlighted.
2. Use the arrow keys to select the `CALC` menu title. The `Calc` menu appears.
3. Select item #1, `1-Var Stats`. The phrase `1-Var Stats` appears in the window.
4. Press `2nd L1`.
5. Press `ENTER`. A list of statistics appears. The first one is the mean.
6. Use the arrow keys to scroll down the list. The median is labeled `Med`.

### Method 2 (Mean)

1. Press `2nd LIST`. The `List` menu bar appears. The `NAMES` menu title is highlighted.
2. Use the arrow keys to select the `MATH` menu title. The `Math` menu appears.
3. Use the arrow keys to select `mean`. Or press 3 and skip the next step.
4. Press ENTER. Now `mean(` appears in the display.
5. Enter the name of the column, `L1`.
6. Press `)` (close parenthesis).
7. Press `ENTER`. The mean appears in the display.

### Method 3 (Mean)

1. Press `2nd LIST`. The `List` menu bar appears. The `NAMES` menu title is highlighted.
2. Use the arrow keys to select the `MATH` menu title. The `Math` menu appears.
3. Use the arrow keys to select `sum`. Or press 5 and skip the next step.
4. Press `ENTER`. Now `sum(` appears in the display.
5. Enter the name of the list, `L1`.
6. Press `)` (close parenthesis).
7. Press ÷ (divide). A slash `/` appears.
8. Enter the sample size.
9. Press `ENTER`. The mean appears in the display.