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in the decade of 1980 the average number of cases of diphitheria reported each year in the USA
was 2.5. whats probability that exactly 3 were reported in a given year?
Solution
use the poisson distribution with mean = = 2.5
P(x=3) = (2.5^3)(e^-2.5)/3! = .2138

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in the decade of 1980 the average number of cases of diphitheria rep.pdf

  • 1. in the decade of 1980 the average number of cases of diphitheria reported each year in the USA was 2.5. whats probability that exactly 3 were reported in a given year? Solution use the poisson distribution with mean = = 2.5 P(x=3) = (2.5^3)(e^-2.5)/3! = .2138