12. (6 points) Suppose that the number of hurricanes in a given year has Poisson distribution with mean 3, and that the occurrence of hurricanes in any given year is independent of that in any other year. Consider a 2 year period (say 2009 and 2010). Find the probability that there are at least 3 hurricanes in this 2 year period.
Added by Valerie W.
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The number of hurricanes in a given year has a Poisson distribution with mean 3. So, let X be the number of hurricanes in a year, then X ~ Poisson(3). Show more…
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