Air Raid Inc. designed 50 air-conditioning systems designed for use by astronauts in the International Space Station. All of them were operated for 1,000 hours at NASA’s test facility. Out of all the systems 2 of them failed during the test. One of them after 200 hours and the other after 600 hours. What is the Percentage Failure Rate?
A. 0.000041 failure/unit-hour
B. 0.000376 failure/unit-hour
C. 0.058968 failure/unit-hour
D. 0.187597 failure/unit-hour
E. 3 failures/unit-hour
Answer: A. 0.000041 failure/unit-hour
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