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Poisson Distribution

  1. May 21, 2009 #1
    I need to fit a Poisson distribution to this set of data (no. of counts of radioactive decay)

    The number of counts in a fixed time interval was recorded 500 times.

    With the number of counts going from 0 - 9 respectively

    39
    106
    130
    100
    67
    34
    15
    7
    1
    1

    I understand how to use the formula in simple probability situations but am a little stuck with this one.

    I know the mean = the variance and worked that out to be 67.1 but when using this in the formlua I calculated explodes (shows math error).

    Can someone help me please?
     
  2. jcsd
  3. May 21, 2009 #2

    mathman

    User Avatar
    Science Advisor
    Gold Member

    How did you get 67.1? Off hand (without doing the arithmetic) the mean looks like it should be around 2+.

    (39x0 + 106x1 + 130x2 + ..... + 1x9)/500
     
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