Use Bayes' Rule to Find the Indicated Probability

question 9

Multiple Choice

Use Bayes' rule to find the indicated probability.
-Two stores sell a certain MP3 players.Store A has 34% of the sales,5% of which are of defective items,and store B has 66% of the sales,1% 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 a defective item of this product as a gift.What is the probability it came from store B?

• A)0.22
• B)0.7083
• C)0.275
• D)0.5667