In my one coop i have 10 hens, 7 white leghorns and 3 golden comets. I usually get 10 eggs a day from that coop, every now and again(maybe every other week to every 2 weeks) someone takes a day off and i only get 9 eggs. But those hens expessially the leghorns are bred specifically for production.
In my other coop, I have some austrolorp mixes, an EE, a cochin cross a RIR, and a couple red sex links. Even though austrolorps are good egg layers these mixes are not. Out of 12 hens in that coop two are broody so 10 layers, i get maybe 6 eggs a day the sex links and the rir lay almost everyday.
So like others have said it depends on the breeds you get. and how old they are.