Results 1 to 2 of 2

Math Help - Probability using distribution(lambda)?

  1. #1
    Newbie
    Joined
    Dec 2008
    Posts
    5

    Probability using distribution(lambda)?

    Thank you for reading! In this exercise, I think the lambda sign threw me off.

    Here's the problem:

    The number of monthly repairs on a computer (I'm guessing it was a PC, lol!) is a random variable that has the distribution with \lambda = 5.5. Find the probability that the computer works for a month:

    a) without need for repairs
    b) with need of two repairs

    Is it THIS formula? ==> f(x,\lambda) = \frac{\lambda^x e^{-\lambda}}{x!}

    If so, what would e be? I'm assuming that \lambda is given (=5.5) and I'm guessing x is the number of repairs needed on the computer (which would be x!=0! on "a" and x!=2! on "b").

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

  2. #2
    Behold, the power of SARDINES!
    TheEmptySet's Avatar
    Joined
    Feb 2008
    From
    Yuma, AZ, USA
    Posts
    3,764
    Thanks
    78
    This is called the Poisson distribution!

    See this link and then show us what you have tried.

    Poisson distribution - Wikipedia, the free encyclopedia
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. [SOLVED] Eigenvalues of y''+2y'+\lambda y=0
    Posted in the Differential Equations Forum
    Replies: 11
    Last Post: February 26th 2011, 05:46 PM
  2. Replies: 1
    Last Post: February 18th 2010, 01:54 AM
  3. Replies: 1
    Last Post: October 29th 2009, 04:58 PM
  4. Lambda calculus
    Posted in the Calculus Forum
    Replies: 3
    Last Post: February 13th 2009, 09:02 PM
  5. show that V(X) = lambda
    Posted in the Advanced Statistics Forum
    Replies: 3
    Last Post: January 11th 2009, 03:50 AM

Search Tags


/mathhelpforum @mathhelpforum