Posted by Jen on .
Use the Poisson Distribution to find indicated probability.
A naturalist leads whale watch trips every morning in March. Teh number of whales seen ha a Poisson distributyion with a mena of 2.2. Find the probability that on a randomly selected trip, the number of whales seen is 5.

Statistics 
SraJMcGin,
Thank you for using the Jiskha Homework Help Forum. This i s not my area, but here are some sites on Poisson Distribution:
1. http://en.wikipedia.org/wiki/Poisson_distribution
2. (part II of #1): http://en.wikipedia.org/wiki/Poisson_process
3. http://mathworld.wolfram.com/PoissonDistribution.html
4. http://hyperphysics.phyastr.gsu.edu/Hbase/math/poifcn.html
5. http://www.itl.nist.gov/div898/handbook/eda/section3/eda366j.htm
6. (queing, etc.): http://home.ched.coventry.ac.uk/Volume/Vol4/listof.htm 
Statistics 
JenCan anyone else help me?,
Help

Statistics 
economyst,
Jen:
If you went to the wikipedia site suggested by SraJMcGin, you would have the formula for calculating probabilities following a poisson distribution.
The Poisson distrbution is
f(k,a) =(a^k)*(e^a)/k! where a is the expected observed in a time period, and k is the actual observed, and e is the exponential e. (Go to the wikipedia site; they can express formulas much better than here on Jiskha.)
In your example a=2.2, and k=5. Plug these into your formula. Hint: I get about 4.8%