Results 1 to 4 of 4

Math Help - joint probability distribution ( plz help me to solve it)

  1. #1
    Junior Member
    Joined
    Jun 2010
    Posts
    30

    Post joint probability distribution ( plz help me to solve it)

    dear
    please help me to solve the Q joint probability distribution ( plz help me to solve it)-sta-q-2.gif
    Last edited by mr fantastic; June 25th 2010 at 11:26 PM. Reason: Deleted "plzzzzzzzzzzzzz" from the post.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Flow Master
    mr fantastic's Avatar
    Joined
    Dec 2007
    From
    Zeitgeist
    Posts
    16,948
    Thanks
    5
    Quote Originally Posted by samileo31 View Post
    dear
    please help me to solve the Q Click image for larger version. 

Name:	sta Q 2.GIF 
Views:	23 
Size:	12.0 KB 
ID:	17996
    Aply the definitions you're meant to have been taught and which I'm sure will be in your classnotes or textbook.

    (a) E(aX + bY) = aE(X) + bE(Y).

    (b) Pr(Y = 0) = 3/28 + 9/28 + 3/28 = 15/28. All the others done in a similar way.

    (c) E(X) = 1(0.1 + 0.2 + 0.2) + 2(0.15 + 0.30 + 0.15) = .... E(Y) done in a similar way.


    If you need more help, please show all your work and say where you're stuck.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    Jun 2010
    Posts
    30

    Post please check it joint probability

    please find the attached file of Q
    check my answer.


    part a)
    E(2X + 5Y) = 2E(X) + 5E(Y) = 2*4 + 5*1 = 13


    part b)
    P(Y = 0) = (3 + 9 + 3)/28 = 15/28




    1
    2

    1
    0.10
    0.15
    0.25
    2
    0.20
    0.30
    0.50
    3
    0.10
    0.15
    0.25

    0.40
    0.60
    1.00
    E(X) = 1*0.40 + 2*0.60 = 1.6
    E(Y) = 1*0.25 + 2*0.50 +3*0.25 = 2
    Attached Thumbnails Attached Thumbnails joint probability distribution ( plz help me to solve it)-sta-q-2.gif  
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor
    Joined
    May 2010
    Posts
    1,030
    Thanks
    28
    all ok
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Joint Probability Distribution
    Posted in the Statistics Forum
    Replies: 2
    Last Post: September 25th 2011, 05:31 PM
  2. Joint Probability Distribution
    Posted in the Advanced Statistics Forum
    Replies: 4
    Last Post: October 23rd 2010, 05:21 PM
  3. Joint Probability Distribution
    Posted in the Advanced Statistics Forum
    Replies: 3
    Last Post: November 25th 2009, 09:24 PM
  4. joint probability distribution
    Posted in the Advanced Statistics Forum
    Replies: 0
    Last Post: November 3rd 2007, 08:54 AM
  5. PLEASE HELP!joint probability distribution
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: November 1st 2007, 12:33 PM

Search Tags


/mathhelpforum @mathhelpforum