Which statement correctly defines MTTR and MTBF?

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Multiple Choice

Which statement correctly defines MTTR and MTBF?

Explanation:
Understanding these two maintenance metrics is key. MTTR, or mean time to repair, is the average time required to fix a failed item and bring it back to service. It tells you how long downtime tends to last once a failure occurs and how quickly you can recover. MTBF, or mean time between failures, is the average time the system operates before the next failure happens. It reflects reliability and how often you’ll have interruptions. The statement uses the standard terminology for these concepts: repair time for MTTR and the time between successive failures for MTBF. Together, they’re used to estimate availability, which is MTBF divided by (MTBF plus MTTR). Example: if a machine runs about 200 hours between failures and takes about 5 hours to repair, MTBF = 200 hours and MTTR = 5 hours, giving an availability of 200 / (200 + 5) ≈ 0.975 (97.5%). Other phrasings use nonstandard terms or swap the idea of repairing with recovering, or refer to time before repair, which don’t align with the widely accepted definitions of these metrics.

Understanding these two maintenance metrics is key. MTTR, or mean time to repair, is the average time required to fix a failed item and bring it back to service. It tells you how long downtime tends to last once a failure occurs and how quickly you can recover.

MTBF, or mean time between failures, is the average time the system operates before the next failure happens. It reflects reliability and how often you’ll have interruptions.

The statement uses the standard terminology for these concepts: repair time for MTTR and the time between successive failures for MTBF. Together, they’re used to estimate availability, which is MTBF divided by (MTBF plus MTTR).

Example: if a machine runs about 200 hours between failures and takes about 5 hours to repair, MTBF = 200 hours and MTTR = 5 hours, giving an availability of 200 / (200 + 5) ≈ 0.975 (97.5%).

Other phrasings use nonstandard terms or swap the idea of repairing with recovering, or refer to time before repair, which don’t align with the widely accepted definitions of these metrics.

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