1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Joint density

  1. May 2, 2013 #1
    1. The problem statement, all variables and given/known data
    Let the joint density of the material and labor cost of a project be modeled by
    fx,y(u,v) = 2v*e-v*(2+u) u,v ≥ 0
    = 0 otherwise

    a) find marginal density of X and Y
    b) find E(Y)


    2. Relevant equations
    Marginal density of Y should be ∫fx,y(u,v) du from 0 to ∞, unless there is some other relationship between X and Y, and u and v that I am missing. I get undefined when trying to do this integral, so I know it can't be right.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. May 2, 2013 #2

    Ray Vickson

    User Avatar
    Science Advisor
    Homework Helper

    Show your work; the integration gives a simple, finite answer, so you must be doing something wrong.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Joint density
  1. Joint density (Replies: 3)

Loading...