Arrivals at a box office in the hour before the show follow the Poisson distribution with $\lambda$ = 7 per minute. Service times are constant at 7.5 seconds. Find the average length of the waiting line.

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The Answer of Arrivals at a box office in the hour before the show follow the Poisson distribution with $\lambda$ = 7 per minute. Service times are constant at 7.5 seconds. Find the average length of the waiting line.

Arrivals at a Box Office in the Hour Before the Show