Question

Let the random variables X and Y have joint cdf as follows: F(x,y) = {1-e^-4x-e^-5y+e^-4x-5y, x>0,...

Let the random variables X and Y have joint cdf as follows:

F(x,y) = {1-e^-4x-e^-5y+e^-4x-5y, x>0, y>0

0, otherwise

Find the correlation coefficient of X and Y

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