Results 1 to 4 of 4

Math Help - Continuous random variables question.

  1. #1
    DCU
    DCU is offline
    Newbie
    Joined
    Jan 2009
    Posts
    20

    Continuous random variables question.



    I know that c =1. Easy enough to do. I don't know how to do the rest though.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    DCU
    DCU is offline
    Newbie
    Joined
    Jan 2009
    Posts
    20
    I really need help with this urgently. I've an exam in the morning and it could come up. Any help would be greatly appreciated.

    Ignore part(a)
    Last edited by DCU; August 26th 2009 at 01:43 PM.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Member
    Joined
    Mar 2009
    Posts
    91
    OK, if you insist. Here it comes, ready or not...

    You could try f_{X+Y}(z)=\frac{\mathrm d}{\mathrm dz}\mathrm P(X+Y\leq z), where perhaps \mathrm P(X+Y\leq z)=\int_{X+Y\leq z}f_{X,Y}\mathrm dA=\int_{-\infty}^\infty\int_{-\infty}^{z-y}f_{X,Y}(x,y)\mathrm dx\mathrm dy.

    So maybe f_{X+Y}(z)=\int_{-\infty}^\infty f_{X,Y}(z-y,y)\mathrm dy.

    Tired now, need sleep... f(zzzzzzzzzzzzzzzzzzzzzzzzzzzzz
    Follow Math Help Forum on Facebook and Google+

  4. #4
    DCU
    DCU is offline
    Newbie
    Joined
    Jan 2009
    Posts
    20
    Thank you! I thought that might be it, but it seemed too easy!
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 2
    Last Post: September 3rd 2011, 06:26 PM
  2. Continuous Random Variables
    Posted in the Statistics Forum
    Replies: 2
    Last Post: November 1st 2009, 11:14 PM
  3. continuous random variables
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: October 20th 2009, 03:19 AM
  4. Continuous random variables
    Posted in the Advanced Statistics Forum
    Replies: 2
    Last Post: January 22nd 2009, 07:30 AM
  5. continuous random variables
    Posted in the Advanced Statistics Forum
    Replies: 3
    Last Post: May 21st 2006, 11:00 AM

Search Tags


/mathhelpforum @mathhelpforum