Of course, to find the mean, median, or standard deviation of a list of numbers on a calculator, you first have to enter them. As far as I can tell, the TI-83 Plus insists that you do so in a list. Therefore, it really helps to be comfortable with list creation and the list menus if you want to get the mean, median, and standard deviation on the TI-83 Plus.<\/p>\n
Example<\/strong>: \u00a0Find the mean, median and standard deviation of the list of numbers Solution: \u00a0There are several ways to do this. \u00a0We’ll focus on one way in this post.<\/p>\n Step 1: \u00a0In between curly brackets, which you access by 2nd ( <\/span> or 2nd )<\/span>, enter the numbers, separated by commas. The comma key is just left of the left bracket key. Key in<\/p>\n 2nd ( -10.2, 55, 67, 100.9, 36, 120, -66 2nd )<\/span><\/p>\n Step 2: Press the STO> button.<\/p>\n Step 3: Think of a name for your list. I called mine SUSAN<\/span>. To key in the letters, first press 2nd, then the green ALPHA key. This will lock the keys in ALPHA mode. To name mine SUSAN<\/span>, I keyed in the following:<\/p>\n 2nd ALPHA LN 5 LN MATH LOG<\/span>. You’ll see the letters in green above those keys.<\/p>\n Step 4: Press ENTER<\/span>.<\/p>\n On my calculator, after I’ve successfully entered my list, it reprints across the screen. By pressing the blue sideways arrow keys (top right of the keypad), I can scroll through the list to check the values.<\/p>\n Assuming you’ve successfully entered the list, the hard part’s done:)<\/p>\n Step 5: To find the mean of the list, press 2nd STAT<\/span>, then arrow across the top to the MATH choice.<\/p>\n Step 6: Press 3<\/span>, which is the mean(<\/span> option.<\/p>\n Step 7: Press 2nd STAT<\/span>, then scroll down until you find your list name. Press ENTER<\/span> to select it.<\/p>\n Step 8: You’ll find you’re back at the main screen. In my case, it says mean(l<\/span>SUSAN<\/span>. Close the bracket, then press ENTER<\/span>.<\/p>\n Hopefully, you receive the answer 43.242857…<\/p>\n Step 9: To find the median, press 2nd STAT<\/span> to return to the LIST menu. Once again, arrow over to MATH. You’ll see median(<\/span> as choice 4. Key in 4.<\/p>\n Step 10: Retrieve your list by keying in 2nd STAT<\/span>, then scrolling down to your list name and pressing ENTER<\/span> to choose it.<\/p>\n Step 11: Back at the main screen again, I see median(l<\/span>SUSAN<\/span>. Close the bracket and press ENTER<\/span>.<\/p>\n Hopefully, you receive the answer 55.<\/p>\n To find the standard deviation, key in 2nd STAT<\/span>, then arrow over to MATH. You’ll see stdDev(<\/span> is choice 7. Key in 7 to select it, then key in 2nd STAT<\/span> and scroll down to your list. Press ENTER<\/span> to choose your list. Back at the main screen, close the bracket and press ENTER<\/span>.<\/p>\n Hopefully, you receive the answer 64.2407….<\/p>\n There are other ways to accomplish the same results on the TI-83 Plus. For more about them, and much more about using the TI-83 Plus in general, look to future posts:)<\/p>\n Source: TI-83 Plus GUIDEBOOK, Texas Instruments, 1999.<\/p>\n
\n{-10.2, 55, 67, 100.9, 36, 120, -66}<\/p>\n