Si un banco recibe 5,8 clientes por hora, un cajero tarda diez minutos en atender a cada cliente y hay un solo cajero, los clientes tendrán que esperar 4,83 horas para ser atendidos. Si se incorpora solo un cajero más, la espera no baja a la mitad, sino que a solo 3 minutos.

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Prueba: Customer arrivals are modeled as a Poisson process with λ = 5.8/hour. Customer service times are assumed to be exponential with mean 10 minutes. For a single server queue, the expected waiting time is λ/(μ(μ – λ)) where λ the the arrival rate and μ is the service rate. In our example, λ = 5.8 per hour and μ = 6 per hour. De: John D. Cook. "What happens when you add a new teller?". 21 de octubre de 2008 https://www.johndcook.com/blog/2008/10/21/what-happens-when-you-add-a-new-teller/