I've some problem with a kind of exercise
1) There are 2 kind of error ( A and B). A and B are two independent casual variabiles that follow a Poisson distribution. Every 10m^2 i've 0.5 error A and every 25m^2 i've 1 error B.
--Calculate the probability that in a superficie of 5m*4m there there are no error in the central row of 5m*1m
--calculate the probability that if the superficie is 50m^2 there will be 2 error B known that there are 4 error in total (A+B)