Probability for estimate/poisson distribution

Hi

I've searched the forum for topic but I can't seem find one with the same problem, so here goes:

I have Xi given as the number of an occurrence pr quarter.

X1...Xn is independent and Xi~Poisson(a)

I have maximized a for the likelihoodfunction to be $\displaystyle a*=\frac{1}{n}\sum{Xi}$ as an estimation of a.

Now to my question:

For a=1.25 and n=10, what is the probability that a* equals respectively 1.1 and 1.25?

My paper is to be done in a couple of hours, so help would be very much appreciated.. (Smile)

Edit: Even though the couple of hours has gone by, I actually still need som help, so if anyone have a hint or two..?