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Math Help - Discrete Probability Distribution

  1. #1
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    Discrete Probability Distribution

    Please HELP ME to solve these...

    Discrete Probability Distribution-q3.jpgDiscrete Probability Distribution-q6-7.jpg

    Answer:
    Q3: 0.7383
    Q6: 0.6472, (i)2.328, (ii)0.8171
    Q7: (i)0.223, (ii)0.934, (iii)0.050
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  2. #2
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    Quote Originally Posted by cloud5 View Post
    Please HELP ME to solve these...

    Click image for larger version. 

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ID:	19312Click image for larger version. 

Name:	Q6+7.JPG 
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ID:	19310

    Answer:
    Q3: 0.7383
    Q6: 0.6472, (i)2.328, (ii)0.8171
    Q7: (i)0.223, (ii)0.934, (iii)0.050
    I will do 3 first, will be back for (6) and (7) after dinner if no other posters have replied.

    For (3), since the puzzle on Monday has been solved, he is only left with 4 puzzles to solve. This is a case of a binomial distribution.

    X~B(4 , 3/4)

    Then calculate P(X>=3)
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  3. #3
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    #6

    Set up a probability distribution table, with Y=0,1,2,3,>3. Calculate their respective probabilities. Then E(x) and Var(x) will follow.

    Next, find the mode of the distribution. This is similar to the question asked in your previous post.

    #7

    X~P(3)

    Calculate P(X=0)
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  4. #4
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    Quote Originally Posted by mathaddict View Post
    Then calculate P(X>=3)
    How did you know is P(X>=3)? When I first do this, I used P(X>=4), no wonder I can't get the answer. ^^''
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  5. #5
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    Quote Originally Posted by cloud5 View Post
    How did you know is P(X>=3)? When I first do this, I used P(X>=4), no wonder I can't get the answer. ^^''
    Because he has already solved one of the 5 puzzles (the one on Monday) so there are 4 puzzles left to be solved in that week.
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