Why are the arrival of patients at a physician office and the arrival of commercial airplanes
Why are the arrival of patients at a ph ysician 's office and the arrival of commercial airplanes at an airport not Poisson random variables?
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The mean nu mber of patients arriving at the emergency room of Uni versity Hospital on Saturday nights between 10:00 and 12:00 is 6.5. Assuming that the patients arrive randoml y and independently, what is the probabilit y that on a given Saturday night, 5 or fewer patients arrive at the emergency room between 10:00 and 12:00?