The time to failure of fluorescent lights in a large office building is exponentially distributed with a failure rate of 0.03125 hr. how many spare tubes must the building custodian maintain to have at least a 0.95 probability of replacing all failures on a given day? Assume continuous 24-hour use of the lights.

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so Let there be n Reliability 1 Pfailure Since time to failure of fluorescent ligh... View the full answer