Question: Problem 3 In an urn, there are 4 red and 3 blue balls. 4 balls are drawn at random (without replacement). Let a random variable

Problem 3 In an urn, there are 4 red and 3 blue balls. 4 balls are drawn at random (without replacement). Let a random variable X be the difference between the number of red balls drawn and the number of blue balls drawn. a) Determine the range of X. b) Find the p.d.f. of X. c) Find E(X) and Var(X)

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