stuck please help

4. U. S. airlines average about 3.8 fatalities per month (Statistical Abstract of the United States, 2000). Assume that the probability distribution for X , the number of fatalities per month, can be approximated by a Poisson probability distribution with mean 3.8. What is the probability that one fatality will occur during a given month? Notice that in this case we have: x P(X = x) = [3.3%, x = 0,1,2,... )5