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Unformatted text preview: in the factory, M1 produces 35%, M2 produces 25%, and M3 produces 40%. One spring is selected at random from all the springs produced in a given day. If the selected spring is defective, what is the probability that it was produced by M3? Explain any terms you introduce in your answer. (b) You know that a certain letter is equally likely to be in any one of three dierent folders. Let i (which may be < 1) be the probability that you will nd your letter upon making a quick examination of folder i , if the letter is, in fact, in folder i , i = 1 , 2 , 3. Suppose you look in folder 1 and do not nd the letter. What is the probability that the letter is in folder 1? Explain any terms you introduce in your answer....
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