>> Or do you design a product and then *measure* what it's MTBF actually 
>> is?) What exactly is the mean taken over?
> 
> Yes, the mean is generally taken from installation to the present or the last
> reporting period.
> 
> And there is also mean time to repair (MTTR)

So... you design your product, set up a million of them, measure how 
long it takes each one to fail, and take the arithmetic mean of that?

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