Multiple choice

Consider a single server queuing model with Poisson arrivals $(\lambda=4/hour)$ exponential service$(\mu=4/hour)$. The number in the system is restricted to a maximum of 10. The probability that a person who comes in leaves without joining the queue is

  1. $\frac{1}{11}$
  2. $\frac{1}{10}$
  3. $\frac{1}{9}$
  4. $\frac{1}{2}$
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