Results 1 to 6 of 6

Math Help - Stats question

  1. #1
    Junior Member
    Joined
    Nov 2008
    Posts
    68

    Unhappy Stats question

    If 85% of people have a bowl of cereal for breakfast, 60% of people have some toast for breakfast, and 50% of people have both cereal and toast for breakfast, what proportion of people have neither cereal nor toast for breakfast?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Newbie
    Joined
    Jan 2009
    Posts
    3
    Maybe this equation can help (it's called the inclusion-exclusion principle):

    n(R union S) = n(R) + n(s) - n(R intersection S)

    Note: drawing venn diagrams helps too a lot of times
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    Nov 2008
    Posts
    68
    The only problem is, I've never done stats in my life :|... I can do pure math, applied math etc very well, but the last time i done stats was about 5 years ago so im sort of learning everything by scratch to be able to tackle these questions
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Junior Member
    Joined
    Jan 2009
    Posts
    25
    If 50% are having both cereal and toast it means that of the 85% eating cereal only 35% are eating just that.
    Same goes for the toast, of the 60% eating toast only 10% are eating just that leaving 55% eating neither.
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Junior Member
    Joined
    Nov 2008
    Posts
    68
    Thanks for all your replies but I cant see how I can form a formal arguement to do these questions? How would the working to the solution of this problem go? :S
    Follow Math Help Forum on Facebook and Google+

  6. #6
    Junior Member
    Joined
    Jan 2009
    Posts
    25
    When your dealing with these kind of problems the solution is mostly displayed in a venndiagram graphicly.

    Venn diagram
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Stats Question
    Posted in the Statistics Forum
    Replies: 1
    Last Post: September 8th 2010, 05:07 PM
  2. Stats Question
    Posted in the Statistics Forum
    Replies: 1
    Last Post: November 1st 2009, 04:21 AM
  3. Stats Question
    Posted in the Statistics Forum
    Replies: 3
    Last Post: June 26th 2009, 05:02 AM
  4. Stats question. is there enough info to answer the question
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: April 5th 2009, 10:23 PM
  5. Stats question
    Posted in the Advanced Statistics Forum
    Replies: 3
    Last Post: January 6th 2009, 02:38 AM

Search Tags


/mathhelpforum @mathhelpforum