Introductory Statistics
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Two stores sell a certain product. Store A has 39% of the sales, 5% of which are of defective items, and store B has 61% of the sales, 3% of which are of defective items.
The difference in defective rates is due to different levels of pre-sale checking of the product. A person receives one of this product as a gift. What is the probability it is defective?
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