**Notes from class, October 13, 2009.**

Below is the **probablitiy density function** of
the Poisson distribution with mean 17 (in blue) and the
data gathered in class (in red). Each red dot represents
one sample containing as many red rice grains as its *x-*coordinate indicates.

Below is the **cumulative probability function** F
of the Poisson distribution with mean 17 (in
blue) and
the "cumulative data function" G of the data we gathered in class.
(The cumulative probability function F(*x*) is the probability that
X is less than or equal to *x*, where X is a Poisson random variable
with mean 17. The cumulative data function G(*x*) is the *relative
frequency* of the data points with value less than or equal to *x*.)
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