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Math Help - What to study?

  1. #16
    Moo
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    Quote Originally Posted by CaptainBlack View Post
    I have just reviewed his postings and there is something odd about the vast majority of them.

    RonL
    I pointed out some :
    - he starts his messages in the title of the post
    - he doesn't use the [quote] tags
    - he doesn't use the latex, and it seems like he doesn't intend to
    - I agree that there's a strange feeling emanating from some of his posts


    What I suppose :
    - he's an adult


    I think too much, that's bad for the good standing of my synapses.



    Edit :

    Quote Originally Posted by janvdl View Post
    In a few of them he ended up with religion, by going way off topic... Or are you thinking of something else?
    Hihi, I knew you would notice.
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  2. #17
    Bar0n janvdl's Avatar
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    Quote Originally Posted by Moo View Post
    Hihi, I knew you would notice.
    No no, he talks about it in weird ways. Like about what Pascal said about believing or not believing in God. (Check my sig for reference.)

    Besides that he was always referring to people too. Pascal, Newton...

    He also left lines open between every sentence. And I have never seen anyone go off topic like he does.
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  3. #18
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    Quote Originally Posted by janvdl View Post
    Well this question was based on the Binomial Distribution. Other topics you might want to read up on:
    Negative Binomial Distribution
    Geometric Distribution
    Hypergeometric Distribution
    Poisson Distribution
    Exponential Distribution
    Greatly appreciate the suggestions, janvdl.

    I have two ensuing unrelated queries:

    1) In part (c), did you use Normal approximation to the binomial or computation by using a recursive evaluation of binomial probabilities?

    2) Consider three children - A,B, & C - standing in a row playing 'catch the ball'. A can only throw the ball to B and B can only throw the ball to C. The probability of B & C dropping the ball are 'p' & 'q', respectively. What is the expected number of times ball will be thrown by A before it is successfully caught by C?

    Look forward to a terse response.

    Best,
    wirefree
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  4. #19
    Grand Panjandrum
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    Quote Originally Posted by Moo View Post

    What I suppose :
    - he's an adult
    You do realise that some of the regulars/staff here are what you might describe as rather elderly adults, don't you?

    RonL
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  5. #20
    Flow Master
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    Quote Originally Posted by wirefree View Post
    Greatly appreciate the suggestions, janvdl.

    I have two ensuing unrelated queries:

    1) In part (c), did you use Normal approximation to the binomial or computation by using a recursive evaluation of binomial probabilities?

    2) Consider three children - A,B, & C - standing in a row playing 'catch the ball'. A can only throw the ball to B and B can only throw the ball to C. The probability of B & C dropping the ball are 'p' & 'q', respectively. What is the expected number of times ball will be thrown by A before it is successfully caught by C?

    Look forward to a terse response.

    Best,
    wirefree
    Let X be the random variable number of throws until B and C catch the ball.

    X follows a geometric distribution: Geometric distribution - Wikipedia, the free encyclopedia.

    The probability of success in a single throw is (1-p)(1-q).

    E(X) = \frac{1}{(1-p)(1-q)}.


    (Terse enough?)
    Last edited by mr fantastic; June 3rd 2008 at 03:47 AM. Reason: Corrected the probabilty of success. Bonehead that I am I had pq.
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  6. #21
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    Quote Originally Posted by mr fantastic View Post
    Let X be the random variable number of throws until B and C catch the ball.

    The probability of success in a single throw is pq.
    Did you intend probability of success to be 1-pq?
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  7. #22
    Flow Master
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    Quote Originally Posted by wirefree View Post
    Did you intend probability of success to be 1-pq?
    Aha! Careless of me.

    Actually the probability of success (B and C both catch the ball) is (1 - p)(1 - q).
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