- #1
izelkay
- 115
- 3
Homework Statement
Z = X - Y and I'm trying to find the PDF of Z.
Homework Equations
Convolution
The Attempt at a Solution
Started by finding the CDF:
Fz(z) = P(Z ≤ z)
P(X - Y ≤ z)
So I drew a picture
So then should Fz(z) be:
since, from my graph, it looks as though Y can go from negative infinity to positive infinity, and X can go from negative infinity on the left but is bounded by z+y on the right
then should the pdf be:
Edit: sorry I forgot to include the fact that, because fx and fy are independent, f(x,y) = fxfy in the following derivation
?
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