Results 1 to 2 of 2

Math Help - Probability light is on

  1. #1
    Newbie
    Joined
    Sep 2009
    Posts
    13

    Probability light is on

    18% of lamps are left "On" on any given night.

    Suppose that, one night, 16 lamps are randomly selected for examination.

    What is the probability that 4 or more of the examined lamps are "On"?


    Hi... I need help solving this basic probability question, lol. I use to be good with this kind of thing, but I've forgotten how its done and I'm trying to refresh myself :\.

    Any help would be appreciated .
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Master Of Puppets
    pickslides's Avatar
    Joined
    Sep 2008
    From
    Melbourne
    Posts
    5,236
    Thanks
    28

    Re: Probability light is on

    Read up on the 'Binomial Probability Distribution'

    In your problem n=16, p=0.18 and you need to find P(X\geq 4)
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. probability and light colors
    Posted in the Statistics Forum
    Replies: 4
    Last Post: November 24th 2011, 05:29 PM
  2. Probability Density Function for the Lives of Light Bulbs
    Posted in the Advanced Statistics Forum
    Replies: 2
    Last Post: February 15th 2011, 01:43 PM
  3. light waves
    Posted in the Math Topics Forum
    Replies: 2
    Last Post: June 10th 2010, 01:55 PM
  4. Probability and light switch...
    Posted in the Statistics Forum
    Replies: 0
    Last Post: January 19th 2010, 04:34 AM
  5. Light
    Posted in the Math Topics Forum
    Replies: 1
    Last Post: June 19th 2008, 02:18 AM

Search Tags


/mathhelpforum @mathhelpforum