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Math Help - Binomial Probability & Tables

  1. #1
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    Binomial Probability & Tables

    I hate math assignments and it's due tomorrow and the teacher is stupid and won;t help people. I was away when it was explained so i have no idea what to do!!

    Suppose an NBA player makes 90% of his free throws. This player takes 20 free throws in the course of a game.
    Find the probabilits of his making:

    A) Atleast 19 of the 20 free throws.
    B) Less than 15 of the 20 free throws
    C) Exactly 90% od the 20 free throws.
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  2. #2
    Bar0n janvdl's Avatar
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    Quote Originally Posted by 16sammy View Post
    I hate math assignments and it's due tomorrow and the teacher is stupid and won;t help people. I was away when it was explained so i have no idea what to do!!

    Suppose an NBA player makes 90% of his free throws. This player takes 20 free throws in the course of a game.
    Find the probabilits of his making:

    A) Atleast 19 of the 20 free throws.
    B) Less than 15 of the 20 free throws
    C) Exactly 90% od the 20 free throws.
    Lecturers don't explain things twice. Get used to it. Also, most students have very poor excuses for not coming to class. I'm not saying you're one of them though.

    As for your questions:

    The probability of a success is 0,9

    <br />
P(A) =  {20 \choose 19} \left( 0,9 \right) ^{19} \left( 0,1 \right)^{1} + {20 \choose 20} \left( 0,9 \right) ^{20} \left( 0,1 \right)^{0}

    <br />
P(B) = 1 - {20 \choose 15} \left( 0,9 \right) ^{15} \left( 0,1 \right)^{5} - {20 \choose 16} \left( 0,9 \right) ^{16} \left( 0,1 \right)^{4} - {20 \choose 17} \left( 0,9 \right) ^{17} \left( 0,1 \right)^{3} - {20 \choose 18} \left( 0,9 \right) ^{18} \left( 0,1 \right)^{2} - {20 \choose 19} \left( 0,9 \right) ^{19} \left( 0,1 \right)^{1} - {20 \choose 20} \left( 0,9 \right) ^{20} \left( 0,1 \right)^{0}


    90% of 20 throws equal 18 throws.

    P(C) = {20 \choose 18} \left( 0,9 \right) ^{18} \left( 0,1 \right)^{2}
    Last edited by janvdl; May 26th 2008 at 08:03 AM.
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  3. #3
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    mr fantastic's Avatar
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    Quote Originally Posted by 16sammy View Post
    I hate math assignments and it's due tomorrow and the teacher is stupid and won;t help people. I was away when it was explained so i have no idea what to do!!

    Suppose an NBA player makes 90% of his free throws. This player takes 20 free throws in the course of a game.
    Find the probabilits of his making:

    A) Atleast 19 of the 20 free throws.
    B) Less than 15 of the 20 free throws
    C) Exactly 90% od the 20 free throws.
    1. So how long have you had to do this assignment?
    2. What steps did you take to catch up with the work you missed?
    3. I find what you've said about your teacher offensive.
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