Решение задачи N3904 теория вероятностей полная вероятн

3904. At the enterprise that makes the locks, the first workshop produces 20%; the second is 50%; the third - 30% of all locks. Defective products for these workshops are respectively 5%; four%; 2%. Find the probability that a randomly selected lock will be defective.

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