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

Need help about this tnx

  1. May 8, 2012 #1
    can someone show me how to prove that the mean and variance is equal to what is at the top... tnx a lot...:biggrin:
  2. jcsd
  3. May 8, 2012 #2


    User Avatar
    Science Advisor

    Hey mcguiry03 and welcome to the forums.

    You need to specify what the distribution is and what you are trying to do.

    If you are starting with a distribution X and you have Y =aX and want to find the mean and variance of Y then you use the fact that E[Y] = E[aX] = aE[X] and Var[Y] = Var[aX] = a^2Var[X].

    If it is something else, then you will need to specify what is going on and what you are trying to do.
  4. May 8, 2012 #3
    tnx sir
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook