Discrete random variables
Let X and Y be two discrete random variables. Suppose X ? Y . Prove that E[X] ? E[Y ]. Note that you have not been given any information about the equations for the pmf's of X and Y.
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Explain why the 4s, 4p do, 4d, and 4f orbital have the same energy in hydrogen atom but they have different energies in many electron atoms?
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