Further Considering Acceptance Rates

I recently received a further consideration/hold letter from an excellent pro market. This is my third story to make it through a first reader and be recommended to one of the editors for further review. Now, it can be hard to quantify exactly what it means when you get over that first hurdle. There a lot of questions you might ask. How many total submissions does the publication receive? How many stories make through the first round? And, finally, of those stories, how many end up accepted? Usu...