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Hi guys,
I am new in the maintenance field and I request your help regarding the estimation of one specific performance indicator for a group of machines.
Let’s say that I have a set of 10 machines and over a period of time (One week or one month) I estimate one indicator (MTBF or MTTR) of each machine.
How do I calculate the performance indicator (MTBF or MTTR) of the Whole set of machines? Do I divide the total operating hours by the total number of failure (in the case of MTBF)? Or do I calculate the Mean value of the 10 different MTBF Values? (That last method is the way to estimate a mean value afaik. Is it valuable in the maintenance field?

Thanks for your attention!

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