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

Functions of random variable and their expected value

  1. Apr 16, 2010 #1
    suppose we have random variable defined a function of another random variable such that [tex] Y = \mathbb{E}(X) [/tex]
    it seem then [tex] Y[/tex] is a constant. then [tex] \mathbb{E}(Y) = \mathbb{E}(X) [/tex] does this even make sense ?
  2. jcsd
  3. Apr 17, 2010 #2


    User Avatar
    Science Advisor

    If Y=E(X), then it is constant. Calling Y a random variable doesn't make sense. What is the context?
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook