Ten high-technology batteries are tested for 200 hours each. One failed at 50 hours; all others completed the test. FR(%) is ________ and FR(N) is ________.
A) 10%; 1/1850
B) 10%; 1/2000
C) 25%; 1850 hours
D) 90%; 1/2000
E) 10%; 1/1950

Question

Quizplus · Accepted Answer

FR(%) is the failure rate percentage, which is 1 out of 10 batteries failing, or 10%. FR(N) is the failure rate per unit time, calculated as 1 failure in 2000 hours (10 batteries * 200 hours each, minus the 50 hours before the failure occurred).

Ten High-Technology Batteries Are Tested for 200 Hours Each