Posted by **bart** on Monday, June 14, 2010 at 10:57pm.

I cannot figure out how to do standard deviation. standard deviation 2, 5, 47, 11, 13, 48, 39, 36

- Standard Deviation-Please check -
**bart**, Monday, June 14, 2010 at 11:57pm
2-25.125=-23.125 = 534.77

5-25.125=-20.125 = 405.02

47-25.125=21.875 = 478.52

11-25.125=-14.125 = 199.52

13-25.125=-12.125 = 147.02

48-25.125=22.875 = 523.27

39-25.125=13.875 = 192.52

36-25.125=10.875 = 118.27

Sum 2598.41

If I divide by one less,which I am supposed to do I think, I get 371.20 sqrt= 19.27

If I divide by 8 I get 324.80 sqrt=18.02

The possible answers are: A) 24.5 B) 324.9 C) 18 D) 25.1

- Standard Deviation-What? -
**Reiny**, Tuesday, June 15, 2010 at 12:26am
I checked all your calculations and found no errors.

(although you wrote your solutions with incorrect use of the "equal' sign)

Here is a webpage, by Wolfram a dependable source,

which explains the difference in the two methods of finding standard deviation.

Check with your text or your instructor whether you divide by N or N-1 .

I also got 19.27 after dividing by 7 and

18.02 after dividing by 8, so I don't know where they get your answers.

- Standard Deviation-What? -
**Reiny**, Tuesday, June 15, 2010 at 12:26am
oops

forgot to post the webpage.

http://mathworld.wolfram.com/StandardDeviation.html

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