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4115. There are 1,400 lamps, 650 belong to the first ba 2019

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Description

4115. There are 1,400 lamps, 650 belong to the first batch, 350 to the second batch, 400 to the third batch. In the first batch of 9%, in the second - 2%, in the third - 3% 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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