Results 1 to 3 of 3

Math Help - Probility

  1. #1
    Newbie
    Joined
    Jan 2013
    From
    Abington
    Posts
    15

    Probility

    A bag contains 3 orange, 3 red, and 2 black balls. Two balls are to be selected at random, and the first ball selected will be placed back in bag before second marble is selected. What is the probablility that both balls selected will be black? 1/8 or 1/16. I think 1/8 because it is a total of 8 balls. Am I correct?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor

    Joined
    Aug 2006
    Posts
    18,820
    Thanks
    1711
    Awards
    1

    Re: Probility

    Quote Originally Posted by tahirakw View Post
    A bag contains 3 orange, 3 red, and 2 black balls. Two balls are to be selected at random, and the first ball selected will be placed back in bag before second marble is selected. What is the probablility that both balls selected will be black? 1/8 or 1/16. I think 1/8 because it is a total of 8 balls. Am I correct?
    Replacing the ball after it is drawn makes the events independent.
    Therefore, multiply: \left(\frac{2}{8}\right)^2.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Jan 2013
    From
    Abington
    Posts
    15

    Re: Probility

    Thanks. so that gives me 4/64 when I reduce its 1/16?
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Statistical probility, baye's theorem
    Posted in the Statistics Forum
    Replies: 7
    Last Post: December 28th 2011, 06:44 AM
  2. standard deviation and probility
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: November 30th 2011, 05:09 PM
  3. probility and comb and perms
    Posted in the Advanced Statistics Forum
    Replies: 0
    Last Post: April 22nd 2010, 03:03 AM
  4. probility problem
    Posted in the Advanced Statistics Forum
    Replies: 4
    Last Post: February 28th 2010, 06:18 AM
  5. Probility & Statistics TEST TOMMRROW HELP PLS!
    Posted in the Statistics Forum
    Replies: 1
    Last Post: May 21st 2008, 06:43 PM

Search Tags


/mathhelpforum @mathhelpforum