# Expectation and Variance

• Oct 31st 2009, 11:40 AM
selinunan
Expectation and Variance
If anyone helps me with two questions attached, I will be thankful.

Selin
• Nov 1st 2009, 01:21 AM
CaptainBlack
Quote:

Originally Posted by selinunan
If anyone helps me with two questions attached, I will be thankful.

Selin

For the first question you are given enough information to write down joint density:

$f_{X,Y}(x,y)=f_{Y|X}(y|x)f_X(x)$

and the rest follows.

CB