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## Homework Statement

Use the Poisson distribution W=(λ^n/n!)*e^-λ to calculate <n>

## Homework Equations

<n>=ƩW*n

## The Attempt at a Solution

Since W = (λ^n/n!)*e^-λ I wind up with <n>=[(λ^n/n!)*e^-λ]*n

But I really don't know where to go from here. Should I do a Taylor Series. I've tried crossing out the top n and ended up with

[(λ^n/(n-1)!)*e^-λ] but this doesn't seem to help. If anyone can point me in the right direction or a general problem solving strategy that would be great. I'd like to demonstrate more work but I don't know what to do.