Решение задачи N3639 теория вероятностей полная вероятн

3639. Three workers produced for changing 60 parts. Worker productivity refers to 1: 2: 3. The first worker produces an average of 95% of suitable parts, the second - 85%, the third - 90%. Find the probability that, at random, taken from among the parts made per shift is of poor quality.

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