Question: Ten high-technology batteries are tested for 200 hours each. One failed at 20 hours; another failed at 140 hours; all others completed the test. FR(%)

Ten high-technology batteries are tested for 200 hours each. One failed at 20 hours; another failed at 140 hours; all others completed the test. FR(%) is ________ and MTBF is ________.

A) 20%; 880 hours

B) 10%; 1980 hours

C) 20%; 1760 hours

D) cannot calculate from information provided

E) 80%; 920 hours

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