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3987. The store received 20 refrigerators "Biryusa", 35 2019

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Description

3987. The store received 20 refrigerators "Biryusa", 35 refrigerators "Orsk", 4 refrigerators "Minsk". The probability that the refrigerator will not fail during the warranty period is equal to "Biryusa" - 0.8; for Orsk - 0.9; for "Minsk" - 0.95. The buyer bought one fridge. What is the probability that this is the Orsk refrigerator, if it turned out to be reliable?

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Additional information

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

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