Joint Probability Functions

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JohnJames150

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If X and Y are two discrete random variables with joint probability function (x+y)/21 for x=1,2,3 and y=1,2

a) How would you derive the marginal probability functions g(x) and h(y) and are X and Y independent?

b) How would you compute E(X) and E(Y) and Cov(X,Y)
 
JohnJames150 said:
If X and Y are two discrete random variables with joint probability function (x+y)/21 for x=1,2,3 and y=1,2

a) How would you derive the marginal probability functions g(x) and h(y) and are X and Y independent?

b) How would you compute E(X) and E(Y) and Cov(X,Y)
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