You can use your calculator's statistics functions to compute one-variable statistics, such as the mean, median, and standard deviation. The directions below are for the TI-83 and TI-83+, but can easily be adapted to other models.

The first step is to enter your data into a "list." Press the key to bring up the following screen:

Since the EDIT menu is already selected, as is 1:Edit on that menu, simply press to go the following screen:

Enter your data, one by one, by using the number keys on your calculator, pressing the key after each piece of data.

Once the data have been entered, you are ready to compute the statistics. Press the key again to bring up the same screen as before, but this time, use the right arrow key to move over to the CALC menu, as shown below:

Since 1:1-Var Stats is already selected, press the key. At this point, you have to tell the calculator which list you want to use. Since we stored our data in L1, press (the second function on the key), and then press . (NOTE: If you don't enter a list name, the calculator will assume you want to use L1.)

You should now see the following screen:

To see the rest of the statistics for this data set, use the down arrow key to scroll through the rest:

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