stupid standard deviation calculators

supposed to find the Mean, median, and mode for all of these numbers so i can find the standard deviation.

960,950,930,910,910,900,890,890,880,870,870,870,860,860,850,840,840,830,830,830,810,810,800,790,790
,790,770,770,750,730,730,720,700,700,700,690,680,680,680,670,670,670,670,670,660,630,620,620,610,600
,590,560,540,540,540,520,480,380

yet soo far every standard deviation calculator online is telling me that the average of all these numbers is 12495.26
they acknowledge that there are 57 numbers and all the numbers are between 1000 and 350
yet the average is 12495…..

my psych teacher told me (the entire class) not to do this with a calculator that isnt already equipped to deal with this standard deviation crap or we will all get it wrong.

Can you guys tell me wtf i am doing wrong here?
how can i find the standard deviation of all these numbers without using my crap calculator?

I see 58 numbers here, maybe you miscounted?

You have to burn the rope.

Originally posted by MadJedi:

I see 58 numbers here, maybe you miscounted?

both the online SD calculators i used said 57 numbers
now that i recounted, there are 58 numbers

Originally posted by CrowbarOfJustice:

Originally posted by MadJedi:

I see 58 numbers here, maybe you miscounted?

both the online SD calculators i used said 57 numbers
now that i recounted, there are 58 numbers

In any case, there’s (obviously) no way the average can be 12 495. If I didn’t omit and/or add any numbers, the mean should be 739.6551724. You should be able to do the rest from here. The next steps should be calculating each deviation by subtracting them with the mean, squaring the amounts, adding the results together, dividing the result by 57 and square rooting the total.

If you have a TI-84, you can plug them all into your stat list, with each entry in L1 being what you posted. Then, for L2, just put 1 in down until you get to the last number.

Next, go to stat→Calculate→1VarStats. It will give you the standard deviation, which is labeled “Sx”. Mean = x with a line over it. I don’t think it will tell you the mode, but that’s not hard to figure out.

And by the way, a TI-84 is equipped for the standard deviation crap.

If you have a TI-84

nope
TI-30X IIS or whatever

Originally posted by MadJedi:

Originally posted by CrowbarOfJustice:

Originally posted by MadJedi:

I see 58 numbers here, maybe you miscounted?

both the online SD calculators i used said 57 numbers
now that i recounted, there are 58 numbers

In any case, there’s (obviously) no way the average can be 12 495. If I didn’t omit and/or add any numbers, the mean should be 739.6551724. You should be able to do the rest from here. The next steps should be calculating each deviation by subtracting them with the mean, squaring the amounts, adding the results together, dividing the result by 57 and square rooting the total.

thanks man :)

Wolframalpha

http://www.ticalc.org/archives/files/fileinfo/372/37211.html
You could try that then.

Or, you could go http://www.wolframalpha.com/input/?i=Standard+Deviation# and see if you can upload the data from a spreadsheet or something.

Originally posted by ItWasWritten:

You have to burn the rope.

You beat the whole damn gay-ame.

ONTOPIC: You’re supposed to jump with your feet and push with your hands until you get an orange portal in the middle then hop through it and try not to shake your milkshakes too hard.

You have the number “670670” in there.

Originally posted by LukeMann:

You have the number “670670” in there.

I am pretty sure that he meant " 670,670 "

Originally posted by Dante_Dreiman:

Originally posted by LukeMann:

You have the number “670670” in there.

I am pretty sure that he meant " 670,670 "

That actually is the error since including this number instead of two 670s and dividing the total by 57 causes the mean to reach exactly 12 495.26.