Results 1 to 2 of 2

Math Help - probablility with balls part 2

  1. #1
    Super Member
    Joined
    Oct 2008
    From
    Bristol, England
    Posts
    897

    probablility with balls part 2

    hi, this is my question:

    A second bag also containing 3 red balls, 2 yellow balls and 1 blue ball, identical except for their colours.
    Sandi picks one ball from the bag at random.

    B) Given that Sandi does not pick a yellow ball, what is the probability that she picks a red.

    would the probability that she picks a red be 3/6? or would it be 3/4 because you take 2 yellow balls from all the ball put to gether which is 6?

    Thanks
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Dec 2009
    Posts
    3,120
    Thanks
    1
    Quote Originally Posted by andyboy179 View Post
    hi, this is my question:

    A second bag also containing 3 red balls, 2 yellow balls and 1 blue ball, identical except for their colours.
    Sandi picks one ball from the bag at random.

    B) Given that Sandi does not pick a yellow ball, what is the probability that she picks a red.

    would the probability that she picks a red be 3/6? or would it be 3/4 because you take 2 yellow balls from all the ball put to gether which is 6?

    Thanks
    If she chooses a ball, the probability of it being red is \frac{3}{6}

    but given that she did not choose a yellow ball, we know that

    she chose one of the other 4, so your second solution is correct.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 3
    Last Post: October 7th 2011, 04:58 PM
  2. probablility with balls
    Posted in the Statistics Forum
    Replies: 13
    Last Post: May 30th 2010, 12:57 PM
  3. 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, 02:39 AM
  4. probablility
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: April 16th 2008, 12:14 PM
  5. probablility...
    Posted in the Statistics Forum
    Replies: 4
    Last Post: May 24th 2007, 10:23 AM

Search Tags


/mathhelpforum @mathhelpforum