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Product of expectations?

  1. Apr 2, 2010 #1
    say, E(1/x)=a and E(y)=b. a and b are constants and x and y are random variables.

    Can I say E(y/x)=b/a? Thanks.
  2. jcsd
  3. Apr 3, 2010 #2


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    Science Advisor

    Only if x and y are independent. If not, anything can happen - simple example y=x.
  4. Apr 3, 2010 #3
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