The Drain County Health Department knows that venereal disease cases

The Drain County Health Department knows that venereal disease cases in Drain county have a mean of 12 per week and are Poisson distributed. This week there were 18 cases. They are concerned that this might be unusual and an epidemic is breaking out. What is the probability of 18 or more cases in a given week? What is the probability of exactly 18? Which is the more relevant piece of information?

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