My Math Forum Expectation of (aX-bY) ?

 Algebra Pre-Algebra and Basic Algebra Math Forum

 December 17th, 2013, 01:39 PM #1 Newbie   Joined: Nov 2013 Posts: 8 Thanks: 0 Expectation of (aX-bY) ? Hello, I 'm trying to express the following in integral form: E[a/X-b/Y], where E[.] stands for the expectation operator. Let a,b be some nonnegative constants and X,Y are independent nonnegative Gamma distributed random variables. Any help would be useful. Thanks in advance
 December 17th, 2013, 01:56 PM #2 Global Moderator   Joined: May 2007 Posts: 6,683 Thanks: 658 Re: Expectation of (aX-bY) ? Saw your post in Physics Forums. Comment applies here.
 December 17th, 2013, 02:01 PM #3 Newbie   Joined: Nov 2013 Posts: 8 Thanks: 0 Re: Expectation of (aX-bY) ? i 'm interested in evaluating the second on (i.e., a/X - b/Y). Can you be more specific ? the addition formula with what integration bounds exactly? what if i would use the expectation of X and Y seperately (i.e, E[c/X]-E[b/Y])?
 December 18th, 2013, 02:07 PM #4 Global Moderator   Joined: May 2007 Posts: 6,683 Thanks: 658 Re: Expectation of (aX-bY) ? Answered (by me) in Physics Forum.

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### variance of (ax-by)

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