hard · GMAT Quantitative Reasoning
A voltage-trip sensor flags a circuit as defective with probability 0.9 if the unit is defective and probability 0.3 if it is not. After a positive flag, the posterior probability that the unit is defective is 0.5.
What prior probability of defect is implied?
- 1/4
- 1/3
- 9/10
- 1/2
- 3/4
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