Question: 1. In a certain assembly plant, three machines, B, , B, and B, , make 40%,45% and 15%, respectively, of the products. It is known

 1. In a certain assembly plant, three machines, B, , B,

1. In a certain assembly plant, three machines, B, , B, and B, , make 40%,45% and 15%, respectively, of the products. It is known from past experience that 2%, 4% and 3% of the products made by each machine, respectively, are defective. Now suppose that a finished product is randomly selected. (20 points)

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