Results 1 to 2 of 2

Math Help - Probability problem long one

  1. #1
    Newbie
    Joined
    Sep 2008
    Posts
    3

    Probability problem long one

    hey, guys, i have a really hard time with this, please help me

    Suppose that the probability that an individual has been exposed to high levels of carbon monoxide in their lifetime is 0.06 and that the probability that they have been exposed to high levels of nitrogen dioxide is 0.03. What is the probability that an individual has been exposed to either high levels of carbon monoxide or high levels of nitrogen dioxide but not both?

    All i know is that i have to add them because they asked for "or" then i have to subtract because it is a "not both" problem but i have no idea what to subtract

    Thank you for your help guys
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor

    Joined
    Aug 2008
    From
    Paris, France
    Posts
    1,174
    Quote Originally Posted by justiceflare33 View Post
    All i know is that i have to add them because they asked for "or" then i have to subtract because it is a "not both" problem but i have no idea what to subtract
    Hi,
    you are right, but then why don't you just substract the probability that both high exposures happen? Assuming that they are independent of each other, the probability of high levels of both gases is the product of their probabilities. So you end up with a probability 0.06 + 0.03 - 0.06*0.03.

    Laurent.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Tough very long problem need help
    Posted in the Calculus Forum
    Replies: 2
    Last Post: March 25th 2010, 07:56 AM
  2. Long division problem
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: August 12th 2009, 04:23 PM
  3. Intergration - Quite a long problem
    Posted in the Calculus Forum
    Replies: 5
    Last Post: June 15th 2009, 03:03 PM
  4. Help with a long applied DE problem.
    Posted in the Calculus Forum
    Replies: 4
    Last Post: November 30th 2008, 12:29 PM
  5. Probability questions (shouldnt take long)
    Posted in the Statistics Forum
    Replies: 3
    Last Post: March 25th 2007, 09:54 PM

Search Tags


/mathhelpforum @mathhelpforum