Results 1 to 2 of 2

Math Help - Probability question

  1. #1
    Junior Member
    Joined
    Feb 2011
    Posts
    66

    Probability question

    Hi all,
    I have another question that is hurting my head.

    part a) sounds like some binomial question. But the chapter doesnt get to binomial probability yet so I dont think you're supposed to use it.
    I'm thinking i have to use the complement rule; P(A) = 1-P(Acomplement)...but i dont know.

    Please help!
    Many thanks.
    Attached Thumbnails Attached Thumbnails Probability question-photo-30-03-2013-13-43-39.jpg  
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Junior Member
    Joined
    Feb 2011
    Posts
    66

    Re: Probability question

    Would someone be so kind as to vet the solution I've come up with for part a?

    P(fail)=0.95
    Let even A = at least 4 fails before a success
    P(A)=1-P(at least 1 success occurs in the first four trials) = 1-P(B)

    P(B) = P(at least one success occurs in the 1st 4 trials) = 1-P(no successes in the first four trials) = 1-(0.95)^4 = 0.18549

    so P(A)= 1 - 0.18549
    = 0.81451
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 5
    Last Post: February 10th 2013, 02:11 PM
  2. Probability question, please help
    Posted in the Statistics Forum
    Replies: 1
    Last Post: November 25th 2012, 08:07 PM
  3. Probability question involving (A given B type question )
    Posted in the Advanced Statistics Forum
    Replies: 0
    Last Post: November 9th 2009, 09:08 AM
  4. Probability Question
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: October 6th 2008, 10:56 AM
  5. A probability question and an Expectations question
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: January 29th 2006, 06:13 PM

Search Tags


/mathhelpforum @mathhelpforum