hard · GMAT Quantitative Reasoning
A chip lot is defective with prior probability 0.05. A first screen flags defectives with probability 0.9 and healthy lots with probability 0.2. A second independent audit flags defectives with probability 0.85 and healthy lots with probability 0.1.
Given that both screens flag the lot, what is the probability it is defective?
- 0.332
- 0.191
- 0.050
- 0.765
- 0.668
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