4102. Of 1000 lamps, 380 belong to one lot, 270 - to the second lot, the rest to the third. In the first batch 4% of marriage, in the second - 3%, in the third - 6%. One lamp is selected at random. Determine the probability that the selected lamp is defective.

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