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Homework Statement
Find the value of k that makes this a probability density function.
The question does not specify whether X and Y are independent or dependent. That is actually another part this question.
Homework Equations
Let X and Y have a joint density function given by
f(x,y) =e^(-kX), 0<=X<inf, 0<=Y<=1,
k is a constant, and 0 elsewhere
The Attempt at a Solution
I need quite a bit of direction with this question, I have no idea where to start.