How do you find the sum of a list while using a TI-83 Plus?

Question

I've been trying to do standard deviation, but I don't have the cable to download the program, so I've been using the lists, and when I get to the sum of the squares, it get's a bit tedious.

Answer 1

First, you can square the list so that you end up finding the sum of the squares. To do this, go to the lists where you entered the data. At the top of the lists, you should see L1, L2, L3, etc.



Tab over the list you want, so that the name (L1, L2, etc) is highlighted. Now, delete the numbers you see at the bottom of the screen, which should be something like:



L1 = { numbers that you've entered}



Delete those by pressing clear, and then enter L1 (or whichever list number this is in) by pressing 2nd+1 (which is L1) or 2nd+2 (which is L2), etc. After typing in the list that you've selected, press the square button, which is below the white MATH button on your calculator. Press enter. The squares should be in the list now.



For example:



You have 2, 3, and 5 entered into List 3.

Highlight the name L3. Delete the contents, which should look like: L3 = {2, 3, 5}.

Now type: L3^2

Do this by pressing 2nd+3 and then the square sign.



To find the sum of a list, click 2nd + STAT, which is the equivalene of clicking the LIST button.



Tab over to MATH. Now, go down to number 5, which is SUM(



Click it. Type in the list you want it to add by either clicking 2nd+1 (which is L1), 2nd+2 (which is L3) and so on.



You can find the standard devation by instead of clicking number 5, you can click number 7, which is stdDev(



Click it, and do the same as you would do with the SUM( by entering either L1, L2, L3, etc.

Answer 2

For one set of numbers, your calculator can do it for you, and the necessary stuff is already on it.

Enter your numbers in a list. Hit the 'STAT' button. Move over to Calc and the first option is '1-Var Stats' which is 1 Variable Stats. Hit enter. '1 Var Stats' will be appearing on the screen now. Hit 2nd, then press the one key, to get L1 to appear if that's where the numbers are. Now hit enter, and it will calculate a bunch of stats for you, including the sum of the list, and the sum of the squares of the list, which will show up as sigma x and sigma x^2 respectively.



Good luck!

Answer 3

i've got used the two. they are pretty much precisely the comparable. The purposes are the comparable, the layouts are the comparable, and from an invaluable perspective, each and every thing is the comparable. the only modifications are aesthetic (eighty 4 is greater alluring), and the memory on the eighty 4 is larger, because of the fact of this the eighty 4 is speedier, too, yet till you're appearing some intense calculations or apps, it particularly is not particularly substantial. The eighty 4 additionally comes with greater apps by ability of default, and it comes with a cable and application so as which you would be able to connect it on your computing gadget. this is slightly pricier, yet not by ability of too a lot. in case you opt for for an eighty 4, sure, you are able to definitely get it instead of an eighty 3. Functionally, they are the comparable. The keys are the comparable and each thing; they only seem distinctive, yet each and every thing's interior the comparable place, and each thing works the comparable way.

Answer 4

Cassandra not only answered your immediate question but she also told you of an easier way to get the stats the you want. That

'1-var stats' will give you all that you need to know about the list. Make sure that you don't have any zeros at the end of your list. You can use dim to size the list properly, if you need to.