3775. The shop receives the products of three factories. Moreover, the production of the first factory is 20%, the second - 45% and the third - 35% of products. It is known that the average percentage of non-standard products for the first factory is 1%, for the second - 5%, and for the third - 2%. The likelihood of a randomly taken product being non-standard equals ...

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