Waiting Lines

Question $3,$ Problem D$.1$

Part $1$ of $5$

Points: $0$ of $15$

ustomers arrive at Rich Dunn's Styling Shop at a rate of $4$ per hour, distributed in a Poisson fashion. Service times follow a negative exponential distribution, and Rich can perform an avera haircuts per hour.

The average number of customers waiting for haircuts $=$ customers $($round your response to two decimal places$).$