hard · GMAT Quantitative Reasoning
A weld-inspection camera flags a unit as defective with probability 0.85 if the unit is defective and probability 0.15 if it is not. After a positive flag, the posterior probability that the unit is defective is 0.4.
What prior probability of defect is implied?
- 17/20
- 2/5
- 2/19
- 1/2
- 17/19
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