Write the Excel formula for each Poisson probability, using a mean arrival rate of 10 arrivals per hour. a. Seven arrivals. b. Three arrivals. c. Fewer than five arrivals. d. At least 11 arrivals. (a)...

Write the Excel formula for each Poisson probability, using a mean arrival rate of 10 arrivals per hour. a. Seven arrivals. b. Three arrivals. c. Fewer than five arrivals. d. At least 11 arrivals.

(a) Why might the number of calls received per minute at a fire station not be a Poisson event?

(b) Name two other events per unit of time that might violate the assumptions of the Poisson model.