Mean time between failures
From HTMcommunityDB.org
MTBF or mean time between failures ... is the inverse of the device’s failure rate. For example; a device that failed twice in nine years has an MTBF of 4.5 years. Can also be expressed as the number of device-years of of device experience divided by the number of device failures occurring during the period represented by the device experience. The greater the number of devices in the sample and the longer the period of the observations, the closer the estimated reliability will be to the device's true reliability.
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