Question: Please explain my question: It is estimated that worldwide, 1% of those aged 15-49 are infected with the human immunodeficiency virus. in tests for HIV,

Please explain my question: It is estimated that worldwide, 1% of those aged 15-49 are infected with the human immunodeficiency virus. in tests for HIV, blood samples from 36 people are combined. what is the probability that the combined sample tests positive for HIV? Is it unlikely for such a combined sample to test positive?

I am using the binomial formula. Coursehero says that the x would be 0. How do I get to that? How do I find X?

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