Looking at the Data Digest, https://www.purdue.edu/datadigest/, may give you a better idea of how you compare to other applicants.
For example, last year’s entering freshman class had about 53% admission rate to COE for OOS students; the exact percentage that is applicable to you will depend on such variables as gender, race/ethnicity, etc. For COE, the average ACT of matriculated students was 31. By looking at the Data Digest, you can figure out how your GPA compares to the averages of matriculated students.
Purdue’s Common Data Set, see https://www.purdue.edu/oirae/resources.html, can also provide statistical information at Part C that may be useful in helping you gauge your chances. It will also tell you, under Part C7, what factors are “very important,” “important,” “considered,” and “not considered” in admissions decisions.