Suppose we have a random sample $(X_1,X_2,...,X_n)$ from a Poisson distribution $Poi(\lambda)$.
How to find a point estimator of $\lambda$, and compute the mean and variance of the estimator.
Actually, I am confused that how to find $\lambda$. It is because I think that the mean and variance is the $\lambda$. Is it correct?
So, can anyone tell me how to find $\lambda$? Thank you.