Ten High-Technology Batteries Are Tested for 200 Hours Each

Multiple Choice

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