ASQ
CRE · Question #103
Fifteen(15) motors were tested for a total of 1,200 cumulative hours, with four failure occuring. The test was then failure-truncated. If the failure rate is assumed to be constant, what is the 95%…
The correct answer is B. 155 hours. See the full explanation below for the reasoning.
Data Collection and Use
Question
Fifteen(15) motors were tested for a total of 1,200 cumulative hours, with four failure occuring. The test was then failure-truncated. If the failure rate is assumed to be constant, what is the 95% lower confidence limit of MTBF?
Options
- A131 hours.
- B155 hours.
- C609 hours
- D876 hours.
How the community answered
(54 responses)- A4% (2)
- B76% (41)
- C6% (3)
- D15% (8)
Topics
#MTBF#confidence interval#failure-truncated test#chi-square distribution
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