3763. The assembly shop received parts from 3 workshops of the enterprise: 20 parts from shop No. 1, 35 - from shop No. 2, 40 - from shop No. 3. The probability of high-quality manufacturing of parts in workshop No. 1 is 0.9, in workshop No. 2 — 0.7, in workshop No. 3 — 0.5. What is the probability that the selected product will be of high quality at random?

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