medium · GMAT Quant
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?
- dfrac14
- dfrac13
- dfrac910
- dfrac12
- dfrac34
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