hard · GMAT Quant
Helix Desk runs a line that is 30% type A (defect rate 3%) and 70% type B (defect rate 9%). A sampled unit is defective. A second independent unit is then drawn from the same machine.
What is the probability that the second unit is defective?
- dfrac33400
- dfrac18200
- dfrac18
- dfrac9125
- dfrac3100
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