ASQ
CRE · Question #363
The mean of the normal logarithms of the repair times is 4.3 hours with a standard deviation of 0.7 hours. What is the maintainability for an allowed repair time of 120 hours?
The correct answer is C. 0.757. See the full explanation below for the reasoning.
Maintainability and Availability
Question
The mean of the normal logarithms of the repair times is 4.3 hours with a standard deviation of 0.7 hours. What is the maintainability for an allowed repair time of 120 hours?
Options
- A0.187
- B0.243
- C0.757
- D0.976
How the community answered
(39 responses)- A8% (3)
- B15% (6)
- C74% (29)
- D3% (1)
Topics
#lognormal distribution#maintainability calculation#repair time#z-score
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