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Statistical expectation: HOW??


Hi,

How can I do statistical expectation on Mathematica? Does the function
Mean work like an expectation? 
I need to take the expectation of the Erf function with respect
to a parameter, that is discrete with value 1 or -1. Any help
will be appreciated. Thanks...

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
                          Fernando Lombardo
 Univ. of Southwestern Louisiana      EECE              DA CAJUNS!!!  
  fjl at usl.edu    URL:  http://www.ucs.usl.edu/~fjl0014/index.html  
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 



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