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: Probability question help me please

  1. Sep 30, 2007 #1
    URGENT : Probability question help me please !!

    For customers purchasing a full set of tries at a particular tries store, the events :
    A = tries purchsed were made in United States
    B = purchaser has tries balanced immediately
    C = pruchas 1 er requests font-end alignment

    along with A', B' and C'
    Assume the following unconditional and conditional prpbabilities:
    p(A)=0.75
    p(B|A) 0.9
    p(B|A')=0.8
    p(C|AB)=0.8
    P(C|AB')=0.6
    P(C|A' B)=0.7
    P(C| A '  B ' ) = 0.3





    a ) constract a tree diagram consisting of first, second and third -generation branches and place an event label and apporiate probabilty next to each branch.


    b) compute P ( A  B  C )

    c ) compute P ( B  C )

    d ) P (C)


    e) compute P (A |B  C ).the probability of a purchasing of US. tries given that both balancing and an aligment were requested




    Thank you
     
  2. jcsd
  3. Sep 30, 2007 #2
     >> is Intersection symbol
     
  4. Oct 1, 2007 #3

    EnumaElish

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    Homework Helper

    Have you solved any of these? Or thought about? How far did you get?
     
  5. Oct 1, 2007 #4
    try it first and the rest of us will help you.

    We aren't here to solve problems flat out for you...People here want to help, not waste their and your time.
     
  6. Oct 1, 2007 #5
    yes actually I tried to solve it..


    but I did not know how to solve a , c and d

    my solution for b ) is =

    P (C / A intersiction B).P(A intersection B)
    = P ( C/ A intersiction B ) . P (B / A ) . P (A)
    = 0.8 * 0.9 * 0.75 = 0.54




    and e )

    = p (A intersection B intersection C ) / p ( B intersection C )
    = 0.54 / 0.68
    = 0.7941
     
  7. Oct 1, 2007 #6
    Please I need the solution tonight coz I have Quiz in it tommorw morning
     
  8. Oct 1, 2007 #7
    ???????????????????????????????????????????????????????
     
  9. Oct 1, 2007 #8

    HallsofIvy

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    Staff Emeritus
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    So what you are telling us is that you really don't want to learn anything, you just want to trick your teacher into thinking you know it?

    Just out of curiosity, is it at all possible that by "tries" you mean "tires"?
     
    Last edited: Oct 1, 2007
  10. Oct 2, 2007 #9
    so you dunn wanna to help me ?
     
  11. Oct 2, 2007 #10

    HallsofIvy

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    Staff Emeritus
    Science Advisor

    People have been TRYING to help you! You show no sign of wanting to do YOUR part!
     
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