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1. What is P (X > x) if X is a n exponential random variable? 2. What is the moment generating function of a normal

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1. What is P (X > x) if X is a n exponential random variable? 2. What is the moment generating function of a normal random variable? 3. 1. What are the two properties of joint probability mass function of X and Y? 4. 2. When two random variables X and Y are independent? 5. 3. What is the mathematical expectation of u(X1, X2)

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