3950. Electric bulbs are manufactured at 3 plants. The

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3950. Electric bulbs are manufactured at 3 plants. The first plant produces 45% of the total number of light bulbs, the second - 40%, the third - 15%. The production of the first plant contains 70% of standard lamps, the second - 80%, the third - 85. The products of all three factories enter the stores.
1) What is the probability that a lamp purchased at the store will be standard?
2) What is the probability that the lamp is made at the second plant, if it is known that it is standard?

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

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