My Math Forum Joint probability density question:

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 November 26th, 2017, 04:49 AM #1 Member   Joined: Jan 2016 From: Blackpool Posts: 97 Thanks: 2 Joint probability density question: The joint random variables have a density $f(x,y)=x+y$ for 0
 November 26th, 2017, 05:50 AM #2 Member   Joined: Jan 2016 From: Blackpool Posts: 97 Thanks: 2 for E(XY) i got 1/3
 November 26th, 2017, 10:13 AM #3 Senior Member     Joined: Sep 2015 From: USA Posts: 2,091 Thanks: 1087 $E[X]=\dfrac {7}{12}$ is correct Do you see any reason $E[Y] \neq E[X]$ ? $E[X Y] = \dfrac 1 3$ is also correct. Thanks from Jaket1

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