3771. The warehouse receives the products of three factories, the products of the first factory in the warehouse account for 30%, the second - 32%, and the third - 38%. In the production of the first factory 60% of products of the highest grade, the second - 20%, the third - 50%. Find the probability at random to take a product is a product of the highest grade?

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