Question: a) The breakdown data for a plant is collected over 60 days is shown Table A4. Is the maintenance strategy in control? b) A computer

a) The breakdown data for a plant is collected over 60 days is shown Table A4. Is the maintenance strategy in control?

a) The breakdown data for a plant is collected

b) A computer system consists of 6 units. The system functions if 4 of the units are functioning. If the units have an exponential time-to-fail distribution with a failure rate of 0.00051 units per hr:

i. What is the reliability of the system at time = 1000 hrs?

ii. What is the mean time to fail for system?

Table A4. Sample data 3 5 2 1 1 0 2 3 2 2 1 4 4 N 3 3 3 2 2 1 0 4 6 2 5 6 1 4 1 4 3 4 N 7 6 1 2 6 4 2 1 4 3 3 6 8 3 5 3 3 3 2 1 3 5 5 6 3 Table A4. Sample data 3 5 2 1 1 0 2 3 2 2 1 4 4 N 3 3 3 2 2 1 0 4 6 2 5 6 1 4 1 4 3 4 N 7 6 1 2 6 4 2 1 4 3 3 6 8 3 5 3 3 3 2 1 3 5 5 6 3

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