In the long run, the seeds will end up with about 50-50 male to female. If you only buy one pack of 10, you could end up with 10 males. But if you bought a million seeds, most likely you'll end up with very close to 1/2 of each.
More than likely you wont end up with 10 males out of ten seeds, but it could happen. If I plant 10 seeds, I expect about 3 females that I am willing to flower. Sometimes I don't like how a plant grows, so I won't flower it. If it gets too tall, its too slow growing, etc.
If you order 10 seeds, expect about 3 plants to flower, and be happy if there are more. The first pack of seeds I ever bought, I ended up with 9 fems out of 10. Just remember, you only need one killer pheno and it has made the purchase worth it since that will be your mom.