# TI-83 Instructions

## Computing the Mean and the Median

### Method 1 (Mean and Median)

- Press
`STAT`

. The `Stat`

menu bar appears. The `EDIT`

menu title is highlighted.
- Use the arrow keys to select the
`CALC`

menu title. The `Calc`

menu appears.
- Select item #1,
`1-Var Stats`

. The phrase `1-Var Stats`

appears
in the window.
- Press
`2nd L`_{1}

.
- Press
`ENTER`

. A list of statistics appears. The first one is the mean.
- Use the arrow keys to scroll down the list. The median is labeled
`Med`

.

### Method 2 (Mean)

- Press
`2nd LIST`

. The `List`

menu bar appears. The
`NAMES`

menu title is highlighted.
- Use the arrow keys to select the
`MATH`

menu title. The `Math`

menu appears.
- Use the arrow keys to select
`mean`

. Or press 3 and skip the next step.
- Press ENTER. Now
`mean(`

appears in the display.
- Enter the name of the column,
`L`_{1}

.
- Press
`)`

(close parenthesis).
- Press
`ENTER`

. The mean appears in the display.

### Method 3 (Mean)

- Press
`2nd LIST`

. The `List`

menu bar appears. The
`NAMES`

menu title is highlighted.
- Use the arrow keys to select the
`MATH`

menu title. The `Math`

menu appears.
- Use the arrow keys to select
`sum`

. Or press 5 and skip the next step.
- Press
`ENTER`

. Now `sum(`

appears in the display.
- Enter the name of the list,
`L`_{1}

.
- Press
`)`

(close parenthesis).
- Press ÷ (divide). A slash
`/`

appears.
- Enter the sample size.
- Press
`ENTER`

. The mean appears in the display.

This page was last modified on Jan 21, 2002.

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