i know the average gpa for usc is 3.73 uw but does anyone know the approximate average gpa of incoming freshman weighted?
I got into USC last year, I was a 3.83/4.27
Weighted GPA is meaningless outside your high school, unless some known standardized weighting is used (the best known one is the UC/CSU one). It does not look like USC publishes a weighted GPA calculation that it uses (indeed, https://admissionblog.usc.edu/3-876-the-high-school-gpa/ suggests that they just look at the courses and grades on your record), so your question does not have a useful answer.
^ This.