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302. The number of automobile accidents ..-阿摩線上測驗
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302. The number of automobile accidents on any day in a city has a Poisson distribution with
mean 4. The number of accidents on a given day is independent of the number of
accidents on any other day.
Calculate the probability that at most one accident occurs in a three-day period.
(A) 
(B) 
(C) 
(D) 
(E) 