A boss would have had a great GPA every semester.
Anyway, the answer to your question is:
100% chance if you are an engaging interviewee, have great LORs, a great PS, no red flags, etc
0% chance if you are a terrible interviewee, etc., and they find you to be inadmissible
Somewhere between 0% and 100% if you are a good interviewee, they rank you in the middle of the pack for their applicants, and your acceptance hinges on the competitiveness of others. They could find you perfectly admissible but run out of slots for this year, and to be honest, even the admissions committee at these three schools couldn't tell you how things are going to shape up in the end of the cycle