The probability of a randomly selected adult in one country being infected with

Question

The probability of a randomly selected adult in one country being infected with a certain virus is 0.005. In tests for the virus, blood samples from 11 people are combined. What is the probability that the combined sample tests positive for th 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. 0. The probability that the combined sample will test positive is Round to three decimal places as needed.) Is it unlikely for such a combined sample to test positive? 0 A. It is unlikely for such a combined sample to test positive, because the probability that the O B. It is not unlikely for such a combined sample to test positive, because the probability that the combined sample will test positive is greater than 0.05. combined sample will test positive is greater than 0.05. combined sample will test positive is less than or equal to than 0.05. combined sample will test positive is less than or equal to than 0.05. ° C. It is not unlikely for such a combined sample to test positive, because the probability that the O D. It is unlikely for such a combined sample to test positive, because the probability that the

Explanation / Answer

the probability that combined sample will test positive =1-P(none is positive) =1-(1-0.005)11 =0.053645

option B is correct

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