The incidence of polio during the years 1949-1954 was, Ask an Expert

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The incidence of polio during the years 1949-1954 was approximately 25 per 100,000 population. In a city of 40,000 what is the probability of having 5 or fewer cases? In a city of 1,000,000 what is the probability of having 5 or fewer cases? State your assumptions.

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