If terrorists were to destroy entirely one of America's 40,000 shopping malls per week, your chances of being there at the wrong time would be about one in one million or more. If terrorists hijacked and crashed one of America's 18,000 commercial flights per week that your chance of being on the crashed plane would be one in 135,000.
How did you model that? Sounds like a Poisson distribution but you need some inputs for it.
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