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Suppose that portable water treatment system contains five identical valves with a failure rate of 0.3 per 1,000 hours of operation. The equipment operates 18
Suppose that portable water treatment system contains five identical valves with a failure rate of 0.3 per 1,000 hours of operation. The equipment operates 18 hours per day. Spare valves are procured and stocked on a 60-day interval. How many spare valves should be carried in the inventory to ensure a 90% chance of having a spare valve when required. Assume there are 30 days in a month?
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