Solution of problem N3917 probability theory total prob

Solution of problem N3917 probability theory total prob

3917. The warehouse receives products from three factories. The production of the first plant amounts to 2000 products, the second - 3000, the third - 1000. It is known that the average percentage of non-standard products of the first plant is 4, the second - 2, the third - 1. Find the probability that a randomly taken product is defective in a warehouse.

Additional information:

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