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Thread: Where did I go wrong in these three questions?

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    Where did I go wrong in these three questions?




    Hi everyone,

    I just finished taking an online test and found out that some of my answers were wrong. The questions and answers can be found in attached screenshots.

    Question 1 (Suppose T and Z are random variables)
    https://s9.postimg.org/7krqdwirz/image.png

    I got no credit looks like it is completely wrong.

    Question 2 (A game of chance is played....) I got partial credit: 2/5 not sure where I went wrong.
    https://s22.postimg.org/i9k9qtanl/image.png

    And finally Question 3 (According to an article,...) Again partial credit. 9/16
    https://s11.postimg.org/b17cqcpyr/image.png

    Can you please point out where they went wrong and how to correct the mistakes? I don't have a single clue on how to do the first question. Can someone please tell me the steps maybe with an example?

    Please help!

    Thanks in advance
    Attached Thumbnails Attached Thumbnails Click image for larger version

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ID:	6289  
    Last edited by JinjaNinja1; 10-29-2016 at 06:14 AM.

  2. #2
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    Re: Where did I go wrong in these three questions?

    just for q1- there is no way a probability can be negative, so, yes, you were completely wrong. I guess you would need to review the basics of probability calculus before trying this test.

    regards

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    Re: Where did I go wrong in these three questions?

    Quote Originally Posted by rogojel View Post
    just for q1- there is no way a probability can be negative, so, yes, you were completely wrong. I guess you would need to review the basics of probability calculus before trying this test.

    regards
    Hey, thank you for your feedback. I did realize it after the test. What are the steps of solving that problem?

    And also what is wrong in Questions 2 and 3?

    Thanks

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    Re: Where did I go wrong in these three questions?

    Keep in mind for question 2 that if a question asks how much you will lose that in the answer a positive value indicates a loss and a negative value indicates a profit. If they asked how much you would win then a negative value would indicate losing money.
    I don't have emotions and sometimes that makes me very sad.

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    Re: Where did I go wrong in these three questions?


    Q3 First decide what kind of probability distribution you need, and what are the parameters. Also, you can not have a probability that is greater than 1

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