Question: A replaceable and repairable engine starting unit having a high failure rate has an MTBF of 12 operating hours. A backup is even less reliable,

A replaceable and repairable engine starting unit having a high failure rate has an MTBF of 12 operating hours. A backup is even less reliable, with MTBF of 5 hr. If repair averages 3 hr, determine the steady state availability of the engine starting system?

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