Low standard deviation in MTBF is most likely true if the costs to actually perform preventative maintenance are very expensive.
What is MTBF?
The mean time between failures of a technological product is the average time between those failures. The statistic is used to track the dependability and availability of a product. The higher the time between failures, the more reliable the system is.
Mean time before failure and mean time to repair MTBF and MTTR are connected as different steps in a larger process. The time it takes to repair a damaged equipment is the only distinction between MTBF and MTTR. For equipment that requires maintenance, MTBF tracks the interval between failures.
Thus, Low standard deviation in MTBF
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