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OK, so here's a question.
When you look at product datasheets, sometimes they quote an "MTBF"
figure. (As in, Mean Time Between Failures.) The question is... do these
numbers mean anything? Are they a product measurement, or a design goal?
(I.e., do you *design* a product to have an MTBF of over 100,000 hours?
Or do you design a product and then *measure* what it's MTBF actually
is?) What exactly is the mean taken over?
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