| Metrics | Formula |
|---|---|
| Server utilization (ρ) |  |
| Idle probability of staff (P0 ) |  |
| Queue length (Lq) |  |
| Customer number in the system (Ls) |  |
| Waiting time in queue(Wq) |  |
| Waiting time in the system(Ws) |  |
| Metrics | Formula |
|---|---|
| Server utilization (ρ) | |
| Idle probability of staff (P0 ) | |
| Queue length (Lq) | |
| Customer number in the system (Ls) | |
| Waiting time in queue(Wq) | |
| Waiting time in the system(Ws) | |