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Suppose someone who knows 60 of the material covered in a

Question: Suppose someone who knows 60% of the material covered in a chapter of a textbook is taking a five question objective (each answer is either right or wrong, not multiple choice or true-false) quiz. Let X be the random variable that for each possible quiz, gives the number of questions the student answers correctly. What is the expected value of the random variable X - 3? What is the expected value of (X - 3)2? What is the variance of X?

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