1. ## Probability Density Function

Consider the joint cumulative distribution function $H(x,y)$ where

$H(x,y) = F(x)G(y){1+\frac{1}{2}[1-F(x)][1-G(y)]}$

and $F(x)$ and $G(y)$ are both cumulative distribution function of an exponential distribution with a mean value of 1. Determine a joint probability density function of X and Y.

Not sure how to approach or do this. Thanks for the help.

2. Originally Posted by Len
Consider the joint cumulative distribution function $H(x,y)$ where

$H(x,y) = F(x)G(y){1+\frac{1}{2}[1-F(x)][1-G(y)]}$

and $F(x)$ and $G(y)$ are both cumulative distribution function of an exponential distribution with a mean value of 1. Determine a joint probability density function of X and Y.

Not sure how to approach or do this. Thanks for the help.
$h(x, y) = \frac{\partial^2 H(x, y)}{\partial x \partial y}$.