Решение задачи N3936 теория вероятностей полная вероятн

3936. The watches entering the store are made in three factories. The first plant produces 40% of products, the second 15%, the third - 45%. Among the first factory hours, 80% rush, the second factory - 90%, the third - 70%. What is the probability that a watch bought at random is in a hurry?

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