Results 1 to 2 of 2

Math Help - Simple statistics question

  1. #1
    Senior Member chella182's Avatar
    Joined
    Jan 2008
    Posts
    267

    Simple statistics question

    The question goes...

    If 85% of people have a bowl of cereal for breakfast, 60% of people have some toas for breakfast, and 50% of people have both cereal and toast for breakfast, what proportion of people have neither cereal nor toast for breakfast?


    I know it's simple, but I can't remember how to do it can anyone help?

    My preliminary guess (educated, obviously) was 27.5%...
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Junior Member
    Joined
    Nov 2008
    Posts
    68
    Let C=cereal T=Toast N=No breakfast

    P(C) = 0.85 P(T) = 0.60 P(CnT)=0.5

    => P(CuT) = P(C) + P(T) - P(CnT)
    = 0.85 + 0.60 - 0.5
    =0.95
    therefore neither is:

    P(N)=1-0.95 = 0.05
    P(N)=5%
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Simple statistics
    Posted in the Statistics Forum
    Replies: 1
    Last Post: September 3rd 2009, 10:37 PM
  2. a simple statistics problem
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: February 22nd 2009, 02:51 PM
  3. Simple Statistics
    Posted in the Statistics Forum
    Replies: 1
    Last Post: February 1st 2009, 12:14 AM
  4. simple statistics
    Posted in the Statistics Forum
    Replies: 3
    Last Post: November 23rd 2008, 05:58 PM
  5. Simple statistics
    Posted in the Statistics Forum
    Replies: 10
    Last Post: October 28th 2008, 09:52 AM

Search Tags


/mathhelpforum @mathhelpforum