7) Suppose that a random variable X takes on any of the values -1, 0, 1, 2 with respective probabilities: i P{X = i} -1 0.2 0 0.1 1 0.3 2 0.4 Find Pr { X^2 = 1}. A) 0.3 B) 0.9 C) 0.5 D) 0.4 E) none of the above
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