📘 queueing theory

1. **Problem Statement:** Customers arrive at a shop following a Poisson distribution with a mean arrival rate $\lambda = 5$ per hour.

1. **Problem Statement:** Charles, a barber, can shave 4 customers per hour (service rate $\mu=4$), and customers arrive at a rate of 3 per hour (arrival rate $\lambda=3$). We need

1. **Stating the problem:** We need to compare two hairdressers using queueing models: the ex-hairdresser modeled by an M|D|1 queue with deterministic service time $B=\frac{1}{3}$