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4105. Of the 500 lamps, 300 belong to the first batch, 2019

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Description

4105. Of the 500 lamps, 300 belong to the first batch, the rest to the second. In the first batch of 4%, and in the second 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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