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Thread: Probability of Occurance

  1. #1
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    Probability of Occurance




    Hi I'm new to probability and need help with what is probably a simple equation for you guys.

    I am trying to calculate the probability of even A occurring when 1 or more conditions are true.

    When Condition 1 is true Event A happens 22% of the time.
    When Condition 2 is true Event A happens 34% of the time.
    When Condition 3 is true Event A happens 51% of the time.

    What is the probability of Event A happening if Conditions 1, 2, and 3 are all true?
    What is the probability of Event A happening if only Conditions 1 and 3 are true?

    How do I write this formula?

    Thanks!

    Aaron

  2. #2
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    Re: Probability of Occurance

    Hello Aaron!

    I am learning myself but would you use the multiplication rule for this?
    P(A) + P(B) + P(C) - P(AandB) - P(AandC) - P(BandC)

  3. #3
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    Re: Probability of Occurance

    I'm not sure I follow. How do I calculate that?

    Can you show me that mathematically?

  4. #4
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    Re: Probability of Occurance


    Quote Originally Posted by Shiner452 View Post
    Hi I'm new to probability and need help with what is probably a simple equation for you guys.

    I am trying to calculate the probability of even A occurring when 1 or more conditions are true.

    When Condition 1 is true Event A happens 22% of the time.
    When Condition 2 is true Event A happens 34% of the time.
    When Condition 3 is true Event A happens 51% of the time.

    What is the probability of Event A happening if Conditions 1, 2, and 3 are all true?
    What is the probability of Event A happening if only Conditions 1 and 3 are true?

    How do I write this formula?

    Thanks!

    Aaron
    try Baye's theorem

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