Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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

    mathman

    User Avatar
    Science Advisor
    Gold Member

    Only if x and y are independent. If not, anything can happen - simple example y=x.
     
  4. Apr 3, 2010 #3
    cool
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook