s] Suppose X and Y are two jointly distributed random variables (in Part A, feel free to assume these are continuous random variables). Prove/show that oxy = cov(x, y) = E[XY] — E[X]E[Y]. Show all essential steps/arguments. ¹Suppose X and Y are two jointly distributed random variables (in Part A, feel free to assume these are continuous random variables). Prove/show that E[Y] = Ex [Ey|x[Y|X]] (“Law of Iterated Expectations"). Show all essential steps/arguments. ¡ Suppose X and Y are two jointly distributed random variables (in Part A, feel free to assume these are continuous random variables). Prove/show that E[XY] = Ex[XE[Y|X]]. Show all essential steps/arguments.

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