Question

Vaccine A has a 0.9 chance of being effective if a person is type X and only a 0.5 chance if a person is not type X. Vaccine B, on the other hand, has a 0.8 chance of being effective if the person is type X and only 0.6 chance if a person is not type X. It is known that 30% of the population is type X. If a person is selected at random and the drug is administered, which vaccine has a greater chance of being effective?​

Answer 1

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