hard · GMAT Quant
A mill chemist reviews a line that is 50% type A machines (defect rate 2%) and 50% type B (defect rate 7%). A sampled unit is defective. A second independent unit from the same machine is then drawn.
What is the probability that the second unit is defective?
- dfrac29
- dfrac53900
- dfrac14200
- dfrac9200
- dfrac150
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