Решение задачи N3638 теория вероятностей полная вероятн

3638. Two workers produce parts that go to the control department, and the productivity of the first worker is 4 times the productivity of the second. The probability of receiving a defective part for the 1st worker is 0.15, for the second - 0.05. Find the probability that the selected item is randomly defective.

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