If I have 210 widgets with an E(lifespan) of 1 week, and uniform age distribution [0,7] days, with instant replacement, is it reasonable to assume 210/7=30 widgets will need to be replaced daily? What other assumptions are lurking here? Does the shape of lifespan distro matter?
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Except if failure probability depends on day of the week. Extreme case is widgets guaranteed to break on Mondays (regardless of age).
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ah, so it's an Apple product then
End of conversation
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