Two methods, A and B, are available for teaching a certain industrial skill. The failure
Chapter 2, Problem 2.134(choose chapter or problem)
Two methods, A and B, are available for teaching a certain industrial skill. The failure rate is 20% for A and 10% for B. However, B is more expensive and hence is used only 30% of the time. (A is used the other 70%.) A worker was taught the skill by one of the methods but failed to learn it correctly. What is the probability that she was taught by method A?
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