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Math Help - Conditional Probability

  1. #1
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    Conditional Probability

    I'm on the last of my HW problems and seem to be confusing something that should be simple. I'll type up my question below.
    Human Visual Inspection of solder joints on printed circuit boards can be very subjective. Part of the problem stems from the numerous types of solders defects (e.g., pad nonwetting,knee visibility,voids)and even the degree to wich a join possesses one or more of these defects. Cosequently even highly trained ispectors can disagree on the disposition of a particular join.In one batch of 10,000 joins, inspector A found 724 that were judge defective, Inspector B found 751 such joints,and1159 of the joints were judge defective by at least one of the inspectors. Suppose that one of the 10,000 joints is randomly selected. What is the probability that the selected joint was judged to be defective by:

    A. Neither of the two Inspectors?

    B. Inspector A but not Inspector B?

    C. Inspector B but not Inspector A?
    I'm not sure how to even start. Do I need to create a probability tree or a venn diagram? Please help.
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  2. #2
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    Re: Conditional Probability

    Nevermind I got it.
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