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4104. Of the 1000 lamps, 810 belong to the 1st installm 2019

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Description

4104. Of the 1000 lamps, 810 belong to the 1st installment, 70 to the second, and the rest to the third. In the first batch of 10%, in the second 1%, in the third 2% of defective lamps. One lamp is selected at random. Determine the probability that the selected lamp is defective.

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Additional information

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

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