@ The OP, here's the situation as it comes up multiple times a year:

Someone tried to describe statistics to someone new. Person 1 tells person 2 "if you breed a lesser to a normal, half the clutch will be lessers".

Person 3 jumps in and, in the interest of full disclosure, feels it is necessary to tell person 2 that "actually, you aren't guaranteed that half the clutch will be lessers. In fact, each egg has a 50/50 chance of being either, so you CAN end up with all normals, all lessers, or a mix. Statistically, half the clutch should be lessers, but it can swing either way"

Do whatever you want with statistics, but the above example is where you often hear someone saying that "each egg has X% chance of being Y"