A shipment of components consists of three identical boxes. One box contains 2000 components of which 25% are defective, the second box has 5000 components of which 20% are defective and the third box contains 2000 components of which 600 are defective. A box is selected at random and a component is removed at random from the box. What is the probability that this component is defective? What is the probability, that it came from the second box?

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A: It is an important part of statistics. It is widely used.

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