Given the following discrete probability distribution, P(x) 50 0.275 65 0.05 70 0.325 75 0.15 90 0.20 (A) Calculate the expected value of x. Answer: E(X) = (B) Calculate the variance of x. Answer : Var(X) = o² = (C) Calculate the standard deviation of x (express using two decimal places). Answer: o =

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