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I Part b) (3 marks) The time between trains on a rail line at a specific...

I Part b) (3 marks) The time between trains on a rail line at a specific level crossing is well approximated by an exponential distribution with a mean of 1.2 hours between trains. I spend two hours at a picnic site overlooking the level crossing. When I arrive, it has been 1 hour since the last train went by. I count trains as they cross. What is the probability I will have counted at least three trains before I leave?

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