A plastic injection molding machine operates 320 days a year. It is the bottleneck workstation in a process that produces plastic housed wall clocks. Industrial engineers collected data on the probability of machine breakdowns, the costs of preventive maintenance, and the cost of a breakdown. Number of Molding Machine Breakdowns per Day 0 1 2 3 4 Probability of a breakdown 0.30 0.25 0.18 0.14 0.13