Results 1 to 2 of 2

Math Help - Poisson Distrbution quickie

  1. #1
    Junior Member
    Joined
    Sep 2009
    Posts
    47

    Poisson Distrbution quickie

    When lamba = 5

    and you want to know the P(x <= 8)

    why is P(x<=8) = F(8;5)

    but P(x=8) = F(8;5) - F(7;5)

    Im confused, i thought the P(x<=8) would equal
    the sum from 0 to 8

    and P(x=8) would equal F(8;5)
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Member
    Joined
    Oct 2009
    Posts
    218
    Quote Originally Posted by statman101 View Post
    When lamba = 5
    Im confused, i thought the P(x<=8) would equal
    the sum from 0 to 8

    and P(x=8) would equal F(8;5)
    Both statements are correct.

    P(x<=8) =P(x=0) + P(x=1) + P(x=2) + P(x=3) + P(x=4) + P(x=5) + P(x=6) + P(x=7) + P(x=8)
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Normal Distrbution , how to find sign of z
    Posted in the Statistics Forum
    Replies: 1
    Last Post: December 1st 2011, 04:04 AM
  2. Standard Normal Distrbution question
    Posted in the Advanced Statistics Forum
    Replies: 3
    Last Post: December 13th 2010, 02:14 AM
  3. limiting distrbution
    Posted in the Advanced Statistics Forum
    Replies: 3
    Last Post: January 23rd 2010, 09:01 PM
  4. Quickie #13
    Posted in the Math Challenge Problems Forum
    Replies: 7
    Last Post: January 18th 2007, 06:20 PM
  5. Quickie #11
    Posted in the Math Challenge Problems Forum
    Replies: 3
    Last Post: January 14th 2007, 02:35 AM

Search Tags


/mathhelpforum @mathhelpforum