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4091. Of the 1000 lamps, 90 belong to the 1st installme 2019

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Description

4091. Of the 1000 lamps, 90 belong to the 1st installment, 690 to the 2nd and the rest to the 3rd installment. In the first batch of 6%, in the second 5%, in the third 4% 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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