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- To take a particularly simple case, consider a Poisson
distribution of clusters---each of which always contains four
particles.
- For a random variable x with a Poisson distribution
![](img460.gif)
- Now, let random variable y=4x
![](img461.gif)
- i.e., y is always broader than a Poisson of mean
,
which has
.
Geoffrey Fox, Northeast Parallel Architectures Center at Syracuse University, gcf@npac.syr.edu