Question: DETERMINING MEAN TIME BETWEEN FAILURES Twenty air - conditioning systems designed for use by astronauts in Russia's Soyuz spacecraft were operated for 1 , 0

DETERMINING MEAN TIME BETWEEN FAILURES Twenty air-conditioning systems designed for use by astronauts in Russia's Soyuz spacecraft were operated for 1,000 hours at a Russian test facility. Two of the systems failed during the test one after 200 hours and the other after 600 hours. APPROACH To determine the percent of failures [FR(%)], the number of failures per unit of time [FRN], and the mean time between failures (MTBF), we use Equations (17-2),(17-3), and (17-4), respectively.

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