Question: A single-machine workstation in a production line has an average process time of 1 minute to do the job, with a standard deviation of 25

A single-machine workstation in a production line has an average process time of 1 minute to do the job, with a standard deviation of 25 seconds. The machine is having operational issues and thus subject to failure. It can operate for an average of 4 hours before it may fail. When it fails, the maintenance team takes 30 minutes on average to fix the machine. The time to failure follows an exponential description distribution, while the repair times have a standard deviation of 1.5 hours.

the effective variability is equal to 5.477 and it's located at the high level of variability

Q) A proposal was made to implement a preventive maintenance plan for the original machine. In the plan, the machine would be stopped every two hours to do some adjustments. The required adjustments will take 10 minutes on average but the adjustment times are exponentially distributed. Evaluate the effective capacity and level of variability if the proposal is implemented compared to the original machine performance.

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