Crystal, I know this is intuitive, but your chances still greatly depend on several factors:
1) Academic history (GPA, degree, courses taken, MCAT)
2) Health Care experience (physician shadowing, patient interaction, any?)
3) Your personality, your essay and your ability to form an intelligent personal statement
4) Personal achievements, accomplishments
5) Your perceived ability to make it through the program
After the interview your files is sent down to Dominica to be reviewed by the admissions committee here. This group of faculty and administration review all of the information in your application, your transcripts, and your interview letter to determine whether you will make it here at Ross and as a physician.
Without knowing any of your other information, it really is impossible to give you any idea about your chances. Clearly though, you have a better chance now than you did before you were invited for an interview.
Hope this helps at least a little.
MitchDC