Question: Air Raid Inc. designed 2 0 air - conditioning systems designed for use by astronauts in the International Space Station. All of them were operated

Air Raid Inc. designed 20 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 Per Unit Failure Rate?
A ,0.000106 failure/unit hour
B ,0.000504 failure/unit hour
C 0.250346 failure/unit hour
D ,0.0000001 failure/unit hour
E 2 failures/unit hour
 Air Raid Inc. designed 20 air-conditioning systems designed for use by

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