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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