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Mathematics, 19.09.2021 21:20 adjjones2011

The probability of a randomly selected adult in one country being infected with a certain virus is 0.003 . In tests for the virus, blood samples from 21 people are combined. What is the probability that the combined sample tests positive for the virus? Is it unlikely for such a combined sample to test positive? Note that the combined sample tests positive if at least one person has the virus.

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