A plastic injection molding machine operates 348 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 Probability of a breakdown 0 1 2 3 0.32 0.28 4 0.22 0.13 0.05