Weird question, I had someone come and buy some hatching eggs from me yesterday who always do an incubator even though they have a couple of broody hens. They told me that the hatching rate of eggs in a broodys nest is around 30%??? I told them she is sitting on 16 eggs, of course I am sure they will not all hatch but they said I can plan on maybe 5-6 chicks? How do you figure that?