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The number of imperfections in a square yard of a certain material has a Poisson distribution with parameter / = 4. Find the probability that

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The number of imperfections in a square yard of a certain material has a Poisson distribution with parameter /\\ = 4. Find the probability that . a l-squareyard sample Will contain at least one imperfection. . a 2-squareyard sample Will contain at most one imperfection

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