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Thread: Mean of a tree diagram

  1. November 19th 2011, 08:07 AM #1
    Helpmeplease1
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    Mean of a tree diagram

    What is the equation for finding E(S2)

    Thanks

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  2. November 19th 2011, 08:43 AM #2
    Plato
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    Re: Mean of a tree diagram

    E(S_2)=1\cdot \mathcal{P}(1)+6\cdot \mathcal{P}(6)+9\cdot \mathcal{P}(9)
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  3. November 20th 2011, 02:51 AM #3
    Helpmeplease1
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    Re: Mean of a tree diagram

    Quote Originally Posted by Plato View Post
    E(S_2)=1\cdot \mathcal{P}(1)+6\cdot \mathcal{P}(6)+9\cdot \mathcal{P}(9)
    Is P(1) just 1/5 x 2/3???
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  4. November 20th 2011, 03:10 AM #4
    Plato
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    Re: Mean of a tree diagram

    Quote Originally Posted by Helpmeplease1 View Post
    Is P(1) just 1/5 x 2/3???
    Yes.
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  5. November 20th 2011, 03:45 AM #5
    Helpmeplease1
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    Re: Mean of a tree diagram

    So is E(S2) = E(S2|S0)
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