Solving problem N3745 Bayesian probability theory

Solving problem N3745 Bayesian probability theory

3745. 30% of all parts come to the assembly from the first machine, 70% from the second. The probability of marriage is 20% at the first machine, and 10% at the second. Taken at random item was standard. What is the probability that it is made on the second machine?

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Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)