On Fri, 30 Jan 2009 13:42:23 +0000, Invisible <voi### [at] dev null> wrote:
>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)
--
Regards
Stephen
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