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9. Let x be the number of courses for which a randomly selected student at a certain university is registered. The probability distribution of x

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9. Let x be the number of courses for which a randomly selected student at a certain university is registered. The probability distribution of x appears in the accompanying table. X 1 2 3 4 5 6 7 P(X) 0.02 0.03 0.09 0.25 0.40 0.16 0.05 a. What is P(x = 4)? b. What is P(x

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