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21. The random variable X, representing the number of accidents in a certain intersection in a week, has the following probability distribution: X O 2

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21. The random variable X, representing the number of accidents in a certain intersection in a week, has the following probability distribution: X O 2 3 4 5 P(X = X) 0.20 0.30 0.20 0.15 0.10 0.05 On average, how many accidents are there in the intersection in a week

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