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Probability question (details on image)

  1. Mar 30, 2015 #1
    1. The problem statement, all variables and given/known data


    2. Relevant equations


    3. The attempt at a solution
    The superimposed diagram shows that the probability of a noncommunicable disease in a underdeveloped country is 0.37. But it's not correct…

    I tried 0.56*0.78 = 0.44 as the probability of a noncommunicable disease in a underdeveloped country since the probability of a death from a noncommunicable disease is 0.56 and the probability of death in a underdeveloped country is 0.78. The answer is also wrong..

    What am I doing wrong. How do you solve this?
     

    Attached Files:

  2. jcsd
  3. Mar 30, 2015 #2

    jedishrfu

    Staff: Mentor

    it looks like the images are venn diagrams. From the middle diagram you get the .22 in the D set which in the third diagram is 0.02+0.01+0.19

    So how would you find the orange area ie the 0.37 area given the 0.78 and the 0.09 and the 0.32?
     
  4. Mar 31, 2015 #3

    haruspex

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    In the third diagram, you are only interested in the areas that relate to the given condition. What are the numbers in those?
     
  5. Mar 31, 2015 #4

    RUber

    User Avatar
    Homework Helper

    Conditional probability questions should look something like:
    P(N|U)=P(N and U)/P(U).
    You have both of those probabilities.
     
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