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Assume that 87% of the time the covid kit is accurate, and 0.03% of the entire population is infected. Please use the tree diagram to

Assume that 87% of the time the covid kit is accurate, and 0.03% of the entire population is infected. Please use the tree diagram to answer the following questions:

What is the probability of someone actually being infected with covid when tested positive?
When someone is tested positive twice, what is the probability of him actually being infected?

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