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4022. The shop receives the same type of products from 2019

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Description

4022. The shop receives the same type of products from three plants, with the i-th (i = 1,2,3) plant supplying mi percent of the products (m1 = 40%, m2 = 20%, m3 = 40%). Among the products of the i-th plant, ni percent are first-rate (90%, 90%, 80%). Bought one product. It turned out to be first-rate. Determine the probability that the purchased product is released by the 3rd plant.

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Additional information

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

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