From experience we know that candidates from school x have, Ask an Expert

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From experience we know that candidates from SChool X have a 60% probability of passing a licensure exam, those from School Y have a 70% probability and those from School Z have a 85% probability. 40% of candidates come from School X, 40 % from SChool Y and 20% from School Z. Given that a candidate passed the exam what is the probability that they are from school Z?

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