Originally Posted by

**Watts84** Hi all,

I am stuck with the problem below:

The Joint pdf of random variables X and Y: f(x,y) = k/y , 0<x<y, 0<y<1 and f(x,y) = 0, otherwise.

First of all, the question asked to draw a diagram showing the support of the joint pdf.

Probably this is the part that i am unable to do, which leads to problems with later part of the question.

The question asked to calculate k, I integrate with respect to x over the range 0 to y, and then integrate with respect to y over the range 0 to 1.

The answer I get is k = 1, is it correct? Did i integrate the correct range for x and y?

After that the question asked to find: P(0<=X<=1/4, 0<=Y<=1/3).

For X, the range i used to integrate over function f is 0 to 1/4. However, for Y, i am not so sure about it, I guess it is from 1/4 to 1/3? Or 0 to 1/3 for Y?

Any help regarding the problem would be appreciated.

Thank you.