Question 1157921
Poisson has a parameter of 0.04
for 200, would expect a parameter of 8, since the errors are proportional to the sample size.
with a parameter 8, want prob. of 0,1,2,3
this is 0.0423 from the calculator

Can do it by hand
e^(-8)*8^0/0! for 0 failures and that probability is 0.0003
e^(-8)*8^1/1!=0.0027
e^(-8)*8^2/2!=0.0107
e^(-8)*8^3/3!=0.0286

And that sum is 0.0423