How to Find Normal Distribution on a TI-83 Calculator

Finding Normal Distribution with the TI-83

• 1

  Press the "2nd" key. The "2nd" key is usually yellow.

• 2

  Press the "VARS" key. It is the distribution function. It will display a list.

• 3

  Select "2:normalcdf(" from the list by pressing "2" or using the cursor. The cdf stands for cumulative distribution function. This option will help you calculate normal distribution probabilities—the area under the curve. Press "Enter." The screen will display "normalcdf(."

• 4

  Type "-1,1)" into the screen. This will add onto the end of the previous display so that it reads like this: normalcdf(-1,1).

• 5

  Press "Enter" to calculate the normal distribution. In this case, it is 0.6827, which means 68.27 percent.

Graphing Normal Distribution with the TI-83

• 6

  Press "2nd" and "VARS."

• 7

  Choose the menu option for the function you wish to graph, such as "1:normalpdf(."

• 8

  Input your data as you did before.

• 9

  Set the window size to show your data on the screen. Guidelines can be found online or from your teacher.

• 10

  Type the value of "x" using "TRACE." Press "Enter."