# Joint Distrubution

• Jun 22nd 2011, 09:04 AM
worc3247
Joint Distrubution
Let Y and Z be two independent continuous random variables with common probability density function f(x):
$2e^{-2x}$ if $x \geq 0$
$0$ if $x<0$.

How do you calculate the joint probability density function? I know how to do it the other way round, but I cannot see how to do this?
Thanks
• Jun 22nd 2011, 09:09 AM
SpringFan25
Re: Joint Distrubution
are z and y independent?

if so f(z,y) = f(z)f(y)