Puzzled by the "Variance"

*To*: mathgroup at smc.vnet.net*Subject*: [mg86506] Puzzled by the "Variance"*From*: Elements <philyer at gmail.com>*Date*: Wed, 12 Mar 2008 05:29:07 -0500 (EST)

Greeting all I'm puzzled by the function "Variance". We can learn how to calculate variance from this page:http://mathworld.wolfram.com/SampleVariance.html. For example, calculate the sample variance of {1,2,3}. the average of {1,2,3} is 2, then the variance should be ((1-2)^2+(2-2)^2+(3-2)^2)/3=2/3. But mathematica gives that: In[10]:= Variance[{1.0,2.0,3.0}] Out[10]= 1. Why?? -- Best Wishes! Yours Sincerely

**Follow-Ups**:**RE: Puzzled by the "Variance"***From:*"Jaccard Florian" <Florian.Jaccard@he-arc.ch>

**Re: Puzzled by the "Variance"***From:*Murray Eisenberg <murray@math.umass.edu>

**Re: Puzzled by the "Variance"***From:*George Woodrow III <georgevw3@mac.com>