S.O.S. Mathematics CyberBoard

Hello,
Is there a known result about what is the distribution of the sum of constant and a exponentially distributed random variable?
If so, can someone refer me to an article or an e book with this information?
tenx
Marina

"Constant distribution"? What is that? It doesn't sound like it makes sense.

_________________
(\ /)
(O.o)
(> <)
This is Bunny. Copy Bunny into your signature to help him on his way to world domination

Do you mean Y = a + X, where X is exponentially distributed and a is a constant?

If so P(Y < y) = P(a + X < y) = P(X < y - a).

yes, this is what I meant.
But I need to know if Y has any known distribution. I am interested in the expectation of Y
maybe it remains exponentially distributed but with different parameter (y=a+X)? and if so where I can find the proof...

Learn to use google. http://www.stat.wisc.edu/courses/st311-rich/convol.pdf

_________________
(\ /)
(O.o)
(> <)
This is Bunny. Copy Bunny into your signature to help him on his way to world domination

Hi Shadow
You don't have to be rude. To use google you (me) have to know what you are looking for, and I believe this is what the forums for.
Tenx for your help thou, I think that solved my problem.

What I googled was "sum random variables distribution formula" which is what you asked for.

_________________
(\ /)
(O.o)
(> <)
This is Bunny. Copy Bunny into your signature to help him on his way to world domination