Customers arrive at Rich$$ Dunn's Styling Shop at a rate of $2$ per$$ hour, distributed in a Poisson fashion. Service times follow a negative exponential$$ distribution, and Rich can perform an average of $5$ haircuts per hour.

Part $2$

$$a$)$ The average number of customers waiting for haircuts$=$

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enter your response here customers $($round your response to two decimal$$ places$).$