Results 1 to 3 of 3

Math Help - Discrete Probability Distributions

  1. #1
    Junior Member risteek's Avatar
    Joined
    Mar 2008
    From
    Canada, with the penguins
    Posts
    30

    Discrete Probability Distributions

    Ok I think this is a hypergeometric probabiltiy question but I can't break down the numbers.

    Six Chevy vans are being tested by consumer Reports for quality control. In the past, 40% of the vans tested have had some safety problems on delivery such s headlight out or a seatbelt not working, If a sample of 6 vans is taken:
    a) what is the probability of four of the vans having a safety problem?
    b) what is the expected number of vans in the sample that will have a safety prolem?

    I can them if I knew where to break it a part.
    The formula I have is P(x)=aCx^x-aCr-x
    But which numbers go where?
    a=?
    n=?
    r=?
    x=?
    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 risteek View Post
    Ok I think this is a hypergeometric probabiltiy question but I can't break down the numbers.

    Six Chevy vans are being tested by consumer Reports for quality control. In the past, 40% of the vans tested have had some safety problems on delivery such s headlight out or a seatbelt not working, If a sample of 6 vans is taken:
    a) what is the probability of four of the vans having a safety problem?
    b) what is the expected number of vans in the sample that will have a safety prolem?

    I can them if I knew where to break it a part.
    The formula I have is P(x)=aCx^x-aCr-x
    But which numbers go where?
    a=?
    n=?
    r=?
    x=?
    You're probably meant to assume that there's a large number of vans you've chosen from. In which case, if X is the random variable 'number of bad vans' then X ~ Binomial(n = 6, p = 0.4).
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member risteek's Avatar
    Joined
    Mar 2008
    From
    Canada, with the penguins
    Posts
    30
    Ok thanks. C:
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 0
    Last Post: April 19th 2011, 05:48 AM
  2. Replies: 0
    Last Post: November 4th 2010, 05:22 PM
  3. discrete probability distributions
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: September 22nd 2009, 03:10 AM
  4. discrete distributions
    Posted in the Advanced Statistics Forum
    Replies: 2
    Last Post: November 19th 2008, 07:19 AM
  5. Discrete Probability Distributions
    Posted in the Statistics Forum
    Replies: 2
    Last Post: November 16th 2008, 01:12 PM

Search Tags


/mathhelpforum @mathhelpforum