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 DeviationPlease check  bart, Monday, June 14, 2010 at 11:57pm
225.125=23.125 = 534.77
525.125=20.125 = 405.02
4725.125=21.875 = 478.52
1125.125=14.125 = 199.52
1325.125=12.125 = 147.02
4825.125=22.875 = 523.27
3925.125=13.875 = 192.52
3625.125=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 DeviationWhat?  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 N1 .
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 DeviationWhat?  Reiny, Tuesday, June 15, 2010 at 12:26am
oops
forgot to post the webpage.
http://mathworld.wolfram.com/StandardDeviation.html
Answer This Question
Related Questions
 Algebra  Use a calculator to find the mean and standard deviation of the data. ...
 Math  Roughly speaking, the standard deviation indicates how far, on average, ...
 Statistics  1) A Motor Company has purchased steel parts from a supplier for ...
 Statistics  How do you figure this out? For a population that has a standard ...
 Stastics  When we convert xvalue to z score and use Standard Normal ...
 Statistics  A college statistics class conducted a survey of how students spend...
 Statistics  data from sample of 400 cases, variable has 95% confidence interval...
 college math  20. Calculate the range, variance, and standard deviation of the ...
 math: standard deviation  Calculate the standard deviation for the following ...
 math standard deviation  Calculate the standard deviation for the following ...
More Related Questions