Question: An engineering student has been measuring the headways between successive vehicles and determined the average headway of vehicles on a particular stretch of highway is

An engineering student has been measuring the headways between successive vehicles and
determined the average headway of vehicles on a particular stretch of highway is 3.2 sec/veh.
Assuming vehicle arrivals follow a Poisson Distribution, what is the probability that the
engineering student observes 4 vehicles arriving in any 20 second time period?

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