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I roll one die and my friend rolls another die. What is the probability that at...

I roll one die and my friend rolls another die. What is the probability that at least one of us gets an even number?

Let R and S be two independent and identically distributed random variables. E(R) = E(S) = 4. V(R) = V(S) = 3. Let T = R – S. What is V(T)?

Let V(X) = 49. What does the Cov(X,X) equal?

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