Gardiner, Stanley C.; Mitra, Amitava - In: International Journal of Quality & Reliability Management 11 (1994) 1, pp. 6-21
A major US bank has determined that none of its customers should have to wait more than three minutes for service. Presents a procedure that helps management allocate tellers to prevent any customer waiting time from exceeding the three‐minute limit. Uses X¯ and s charts to monitor the...