Hello! The number of school to apply to soely depend on you.. There isn't a set number, I have seen people apply to one and others to 20+. Of course the more schools you apply to, the (slightly) better chances you have of getting in.. And then again, it all depend on your stats, grades, gre, ... Etc. Remmber that the fees to apply to more schools can add quickly from both ptcas and gre score sending services. Also you got to consider secondary application & fees some school charges.. The best way to approach this is to look at your gpa, gre score, and pre-requests courses & grades and match them to the schools requirement .. If you are just barely meeting the minumum standard for that school, you should move on to a less competitive school that will put your application above the minumum.. In addition, look at the number of applicants from pervious cycle and the number of accepted student (this info is easily avaliable) and just do a quick % of accepted from applied! If it's really low, perhaps your application fee is better spent at anotrr school with a higher % acceptance from application( you have to determine what is low % and what is high %). I was in your shoe last cycle with mid gpa, and overall what I considered average stats, and made a desicion to apply to 16 schools ( yes the $ spent was a little to much) but I wanted to increase my chances.. Got 4 waitlists & 2 acceptance..
Best of luck 🙂