Urgent help please- conditional probability

Discussion in 'CT3' started by Nikita90, Apr 16, 2018.

  1. Nikita90

    Nikita90 Member

    Hi everyone.

    Ive had a major block and have completely forgotton all understanding around conditional probability and theres only a day left before the exam. Im desperately trying to get some understanding back. Im looking at question 4 on september 2017 paper and i just cannot do oart 2 onwards.
    My initial problem is that I cant decide when i should be using which formula...

    P(Ae|Do)= p(Ae).p(Do|Ae) or

    P(Ae|Do)= p(Ae n Do)/ p(Do)

    Any advise or tips on understading this would be really appreciated as its quite a common topic.

    Thank you in advance
     
  2. John Lee

    John Lee ActEd Tutor Staff Member

    Personally I would stuff the whole conditional worries and draw a tree diagram.
    It's much much easier to work from this.
     

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