4103. Of 1,000 lamps, 430 belong to one lot; 260 to the second batch; the rest to the third. In the first batch of 8% of marriage, in the second 6%, in the third 4%. 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)