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Jul 18, 2015 at 23:56 comment added DWin Can you check your math? I get lambda=-log(1-0.035)/7 and so lambda = 0.00509
Feb 11, 2015 at 18:54 history bounty ended Alessandro Jacopson
Feb 11, 2015 at 18:54 vote accept Alessandro Jacopson
Feb 5, 2015 at 4:51 comment added Cam.Davidson.Pilon This also works well because of the forgetfulness property of the exponential: given you have survived this last, the probability you fail this next week is equal to that of last week, i.e. your survival is independent of how long you have survived for. (A consequence of a constant hazard rate). This means that if we start with $N$ machines, there will still always be 3.5% failure each week (on average).
Feb 5, 2015 at 0:48 history answered Sven CC BY-SA 3.0