Testing for a disease can be made more efficient by combining samples. If the samples from people are combined and the mixture tests negative, then all three samples are negative. On the other hand, one positive sample will always test positive, no matter how many negative samples it is mixed with. Assuming the probability of a single sample testing positive is 5%, find the probability of a positive result for all three samples combined into one mixture. Is the probability low enough so that further testing of the individual samples is rarely necessary?

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Jimenafuentes1014idn Jimenafuentes1014idn

04-10-2022
Mathematics

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Testing for a disease can be made more efficient by combining samples. If the samples from people are combined and the mixture tests negative, then all three samples are negative. On the other hand, one positive sample will always test positive, no matter how many negative samples it is mixed with. Assuming the probability of a single sample testing positive is 5%, find the probability of a positive result for all three samples combined into one mixture. Is the probability low enough so that further testing of the individual samples is rarely necessary?

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