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OpenStudy (anonymous):
A manufacturer found that among 500 randomly selected smoke detectors only 450 work properly. Based on this information, how many smoke detectors would you have to install to be sure that the probability that at least on of them will work will be at least 99.99%?
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OpenStudy (anonymous):
http://www.algebra.com/algebra/homework/Probability-and-statistics.faq.question.506226.html that'll help maybe
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