# How to Find Standard Deviation on the TI-84 Graphing Calculator

You can find the standard deviation of a data set in two ways with your TI-84 Graphing Calculator. First, have a look at the long lists to calculate the standard deviation from scratch on the TI-84 Graphing Calculator. Then see how to quickly find the standard deviation using one-variable stats. To help your understanding of standard deviation, this video explains what the abbreviations mean and where you can access these variables in your TI-84 Graphing Calculator.

Most functions and commands that you use on the TI-84 Graphing Calculator are found in the menus housed in the calculator. Following is an overview of how to find and select menu items on the TI-84 Graphing Calculator.

# Accessing a TI-84 Plus menu

Each menu on the TI-84 Graphing Calculator has its own key or key combination. For example, to access the Math menu, press [MATH]; to access the Test menu, press [2nd][MATH]. An example of a menu appears in the first screen. This is a picture of the Math menu.

Some menus on the TI-84 Graphing Calculator, such as the Math menu, contain submenus. This is also illustrated in the first screen. This screen shows that the submenus in the Math menu are MATH, NUM, CMPLX, PROB, and FRAC (Math, Number, Complex, Probability, and Fraction). Use the

keys to view the items on the other submenus. This is illustrated in the second and third screens.

## Scrolling a TI-84 Plus menu

After the number 9 in the first two screens, a down arrow indicates that more items are available in the menu than appear on-screen. There’s no down arrow after the 4 in the third screen because that menu has exactly four items.

To see menu items that don’t appear on-screen, repeatedly press the down-arrow key on your TI-84 Graphing Calculator:

To get quickly to the bottom of a menu from the top of the menu, press the up-arrow key. Similarly, to quickly get from the bottom to the top, press the down-arrow key.

## Selecting TI-84 Plus menu items

To select a menu item from a menu on the TI-84 Graphing Calculator, key in the number (or letter) of the item or use the

keys to highlight the number (or letter) of the item and then press [ENTER].

Some menus, such as the Mode menu shown in the first screen, require that you select an item from a list of items by highlighting that item. The list of items usually appears in a single row and the TI-84 Graphing Calculator requires that one item in each row be highlighted.

To highlight an item, use the

keys to place the cursor on the item and then press [ENTER] to highlight the item.

To access Catalog Help on the TI-84 Graphing Calculator, scroll to the menu item you want to use and press [+]. A screen showing the syntax of the command is displayed.

Check out this guide of TI-84 Graphing Caluculator important keystrokes for more information.