Решение задачи N3917 теория вероятностей полная вероятн

3917. The warehouse receives products from three factories. The production of the first plant amounts to 2000 products, the second - 3000, the third - 1000. It is known that the average percentage of non-standard products of the first plant is 4, the second - 2, the third - 1. Find the probability that a randomly taken product is defective in a warehouse.

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