Решение задачи N3909 теория вероятностей полная вероятн

3909. The factory produces bolts, the first machine produces 30%, the second 25%, the third 45% of all products. Marriage in their products is made up respectively 2%, 1%, 3%. Find the probability that a randomly selected bolt is defective.

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