Решение задачи N3910 теория вероятностей полная вероятн

3910. At the bolts factory, the first machine produces 30%, the second 25%, and the third 45% of all products. Marriage in their products is, respectively, 2%, 1%, 3%. Find the probability that a randomly selected bolt will be standard.

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