Solution of problem N3783 probability theory total prob

Solution of problem N3783 probability theory total prob

3783. Billets come from two workshops of the enterprise: 60% from workshop No. 1 and 40% from workshop No. 2. The blanks of the first workshop contain 5% of defects, and the second - 3%. Find the probability that the preset taken at random will be defective.

Additional information:

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