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Solution of problem N3964 probability theory total prob

Content: teorver_3964.doc (24.50 KB)
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3964. Electric bulbs entering the store are manufactured at three plants. The first plant produces 60% of the total number of light bulbs, the second 25% and the third 15%. The production of the first plant contains 85% of standard lamps, the second 90% and the third 70%. What is the probability that a lamp purchased in the store is standard?
Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)
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