Question 321248
This is a Poisson probability.

{{{P(x)=L^n*e^(-L)/n!}}}. Where L is the mean. 

In this case, since they ask for more than 8, we sum up the probabilities from 0 to 8 and subtract from 1.

{{{1-sum ((4.3)^n*e^(-4.3)/n!,n=0,8)=.0317}}}