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12. In the decade of the 19805, the number of X of cases of diphtheria reported each year in the United States followed a Poisson

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12. In the decade of the 19805, the number of X of cases of diphtheria reported each year in the United States followed a Poisson distribution with mean 3.5. What is the probability that (a) No cases were reported in a given year? (b) Exactly four cases were reported? ((3) At least four cases were reported? (d) At most four cases were reported

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