Решение задачи N3766 теория вероятностей полная вероятн

3766. The assembly received parts made on two machines, with 60% of all parts coming from the first machine, of which 80% of parts of the 1st grade and 70% of the parts of the first grade from the second machine. What is the probability that the item taken will be of the first grade?

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