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3986. The store received refrigerators of three firms i 2019

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Description

3986. The store received refrigerators of three firms in the amount of 35, 20 and 4, respectively. The probability that the refrigerator will not fail during the warranty period is: for the first company, 0.95; for the second - 0.8; for the third - 0.9. The purchased fridge was reliable. Find the probability that this refrigerator is manufactured by a second firm.

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Additional information

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

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