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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