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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


    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


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    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


    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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