Choose single queue vs multiple queues

## Bank queue design choice A bank has **5 tellers**. Two possible customer-flow designs: 1. **Single queue**: one common line feeding the next available teller (pooling). 2. **Multiple queues**: **5 separate lines**, one per teller (customers choose a line). ### Questions - Which design would you personally choose as a customer if you want to **minimize expected waiting time**? - Which design leads to **more/less variability (variance)** in waiting time? - State any assumptions you need (e.g., customers arrive randomly; tellers have i.i.d. service times; no line switching/jockeying). - Under what real-world conditions might the “worse” design become preferable (e.g., different teller speeds, priority customers, jockeying, perceived fairness)?