Results 1 to 2 of 2

Math Help - [SOLVED] expected value of marbles

  1. #1
    Newbie
    Joined
    Oct 2008
    Posts
    13

    [SOLVED] expected value of marbles

    questions:

    a) We have 10 marbles in a bag: 7 red, 2 blue, 1 yellow. We randomly pull two marbles, with replacement. Find the expected value of the number of blue marbles pulled.


    b) We have 10 marbles in a bag: 7 red, 2 blue, 1 yellow. We randomly pull two marbles, without replacement. Find the expected value of the number of blue marbles pulled.


    -I can't figure this one out without being given an actual value on the blue marbles, any suggestions?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Newbie
    Joined
    Nov 2008
    Posts
    7
    Try drawing a tree diagram
    for a the prob would aways be choosing 10 marbles.

    for b the first marble would be choosing out of 10 the second choosing out of 9(since you are not replacing)

    hope this helps
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. [SOLVED] Probability with Marbles
    Posted in the Statistics Forum
    Replies: 0
    Last Post: October 22nd 2009, 06:25 PM
  2. Replies: 2
    Last Post: December 9th 2008, 01:55 AM
  3. expected value of marbles
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: November 14th 2008, 09:45 AM
  4. expected value marbles
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: November 8th 2008, 05:31 PM
  5. [SOLVED] expected value
    Posted in the Advanced Statistics Forum
    Replies: 4
    Last Post: April 30th 2008, 09:17 PM

Search Tags


/mathhelpforum @mathhelpforum