Poisson Distribution

[Guest]

How do I form a (more than) probability using the Poisson function in Excell.
I understand the equal to and less than but can only do the (more than) as
individual probabilities "one a t a time"?

 

[Guest]

Prob(X>x) = 1-Poisson(x,lambda,TRUE)
or see Ian Smith's comp_cdf_poisson function
http://members.aol.com/iandjmsmith/examples.xls

Jerry