Results 1 to 2 of 2

Math Help - drawing balls from an urn

  1. #1
    Newbie
    Joined
    Mar 2009
    Posts
    16

    drawing balls from an urn

    Urn A contains n white balls and 2n black balls, while urn B contains n white balls and 3n black balls.
    One of these two urns is chosen at random with equal probability and a ball is drawn from the chosen urn.
    a) What is the probability that this ball is a white ball?
    b) Given that the ball is white , what is the probability that the ball was drawn from urn A?
    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 eyke View Post
    Urn A contains n white balls and 2n black balls, while urn B contains n white balls and 3n black balls.
    One of these two urns is chosen at random with equal probability and a ball is drawn from the chosen urn.
    a) What is the probability that this ball is a white ball?
    b) Given that the ball is white , what is the probability that the ball was drawn from urn A?
    I'd start by drawing a tree diagram ....
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Drawing balls randomly with replacement
    Posted in the Statistics Forum
    Replies: 2
    Last Post: November 14th 2011, 01:59 PM
  2. Replies: 3
    Last Post: October 7th 2011, 05:58 PM
  3. Drawing Balls from Urns with Replacement
    Posted in the Statistics Forum
    Replies: 1
    Last Post: August 24th 2011, 11:03 AM
  4. a basket contains 5 red balls, 3 blue balls, 1 green balls
    Posted in the Advanced Statistics Forum
    Replies: 3
    Last Post: May 28th 2010, 03:39 AM
  5. probability (drawing balls from a bag)
    Posted in the Statistics Forum
    Replies: 2
    Last Post: March 22nd 2010, 05:35 AM

Search Tags


/mathhelpforum @mathhelpforum