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Don't understand this conditional probabillity example

  1. Apr 17, 2012 #1
    At the bottom of the page (example 2) for question c) P(B|A').

    They say P(B n A') = 0.2. But surely it is (B while not A) which in my mind should be 0.15.

    Can somebody tell why it is 0.2?
     

    Attached Files:

  2. jcsd
  3. Apr 17, 2012 #2

    Ray Vickson

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    If the diagram is correct, and if my interpretation of the various numbers there is correct, it should be 0.15, as you want.

    RGV
     
  4. Apr 17, 2012 #3
    Thank you!
     
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