Please show all your working and say where you get stuck.
Note: Wolfram|Alpha
Be sure to click on Show Steps.
To do the definite integral, which is an improper integral, you need to set up a limit.
the joint density of X and Y is given by
f(x,y)= (e^-(x/y)*e^-y)/y 0 <x < inf , 0 < y < inf
show E(x]y=y)
so i worked out the conditional density function=
(e^-x/y )/y (confirmed to be correct)
now i need to integrate from 0 to infinity integral [x*(e^-x/y )/y dx] right???
i'm trying to integrate by parts
I cant show this to = y
Please show all your working and say where you get stuck.
Note: Wolfram|Alpha
Be sure to click on Show Steps.
To do the definite integral, which is an improper integral, you need to set up a limit.