A customer service center needs to schedule enough employees to meet the expected call volumes during the 24 hours of every day. Based on estimated demand, the minimum number of required employees during each four-hour time interval is given
In Table 9.11.
Time Period Minimum Number of
Customer Service Agents Needed
Midnight-4 a.m....................................... 8
4 a.m.-8 a.m........................................... 6
8 a.m.-noon............................................ 12
Noon-4 p.m............................................ 15
4 p.m.-8 p.m........................................... 9
8 p.m.-midnight....................................... 5
The employees can begin their shifts at the beginning of any time period. However, they have to work for 8 hours. What is the minimum number of employees needed to satisfy the requirements?