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Variance

  • To: mathgroup at smc.vnet.net
  • Subject: [mg52047] Variance
  • From: "JFO" <johanfo at gmail.com>
  • Date: Mon, 8 Nov 2004 03:13:38 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com
Can anybody help me out with this?  I'm trying to make mathematica
calculate the variance of an expression, however I don't get the result
I expected, a numerical value.

In[144]:=
<<Statistics`ContinuousDistributions`
a:=NormalDistribution[0,0.1]
b:=NormalDistribution[0,0.1]
c:=NormalDistribution[0,0.1]
z:=0.7a-0.5b-0.8c
Variance[z]

Out[149]=
Variance[-0.6 NormalDistribution[0,0.1]]
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