A chemical plant has an emergency alarm system. When an emergency situation exists, the alarm sounds with probability 0.95; when an emergency situation does not exist, the alarm sounds with probability 0.02. A real emergency situation is a rare event with probability 0.004. Given that the alarm has just sounded, what is the probability an emergency situation exists? a.0.1602 b.0.0034 c.0.2372 d.0.0240

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