Решение задачи N3821 теория вероятностей полная вероятн

3821. Casting in blanks comes from two preparation shops: 65% from the first and 35% from the second. At the same time, the material of the first workshop has 15% of defects, and the second - 25%. Find the probability that one blank at random is free of defects.

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