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Mean Time to Repair and Mean Time Between Failure:They are Maintenance and Reliability predictors.
Divide the total number of incidents by the total time. The result, representing the average number of incidents per unit of time, is the mean as well as the variance of the Poisson distribution.
The answer depends on what information you have from which you wish to calculate time.
MTBF is an abbreviation for "mean time between failures" and is often used by companies to try and improve. A person can calculate the MTBF by dividing the sum of operational hours by the number of failures.
time=distance divided by speed