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Lumifer comments on Tentative Thoughts on the Cost Effectiveness of the SENS Foundation - Less Wrong Discussion
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If you have a 0.1% per year chance of dying "non-naturally", the probability of you surviving for 100 years is 0.999^100 = 90% which looks to be order-of-magnitude correct for contemporary Western countries. This implies that your chances to live for 500 years are 0.999^500 = 60%, for a thousand years -- 37%.
if P(life length=x) = p(1-p)^(x-1) with p=0.001, then E(life length) = 1/p = 1000. It's a geometric random variable.
Which is NOT A FEW HUNDRED YEARS