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A truth serum give to a suspect is known to be 90% reliable when the person is guilty and 99% reliable when the person is innocent.

iii. A truth serum give to a suspect is known to be 90% reliable when the person is guilty and 99% reliable when the person is innocent. In other words 10% of guilty are judged innocent by the serum and 1% innocent is judged guilty. If the suspect was selected from a group of suspects of which only 5% have ever committed a crime, and the serum indicated that is guilty what the probability that he is innocent?

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