The chances are 50/50. While those are the chances, I have been very lop sided for the last three years. Three years ago, I was about 65/35 M/F, then the following year I was about 30/70 and last year, I was back to about 60/40. I think if you look at a large enough number, then it will be 50/50, but smaller sampling sizes can vary quite a bit. Heck I have hatched entire clutches of one sex.