The geometric and exponential distributions are said to be memoryless. How much memory do some other distributions require? (Intended as a serious question.) https://en.wikipedia.org/wiki/Memorylessness …
hmm it could also be a system of a few exponential systems that only breaks down when the % of working systems drops below a threshold
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If we have exponential systems and we wait for first part to fail, we get exponential. If it can survive a % of fails > 0, it's non-exponential. Consistent with memory idea - the set of failed parts comprise the "memory".
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