hard · GMAT Quantitative Reasoning
A weld is defective with prior probability 0.1. A first screen flags defectives with probability 0.8 and healthy lots with probability 0.3. A second independent audit flags defectives with probability 0.7 and healthy lots with probability 0.2.
Given that both screens flag the lot, what is the probability it is defective?
- 0.560
- 0.100
- 0.509
- 0.229
- 0.491
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