It might.
Penn State's 2014 25th-75th percentile ACT Composite Scores are 25-29, meaning 25% of students scored 25 or lower on the ACT Composite Score, and 75% of students scored 29 or lower (i.e. 25% of students scored 29 or higher).
Penn State's 2014 25th-75th percentile ACT scores are 25-30 on the English section, 25-30 on the Math section, and 25-29 Composite.
Penn's 2014 25th-75th percentile ACT scores are 31-35 on the English section, 29-34 on the Math section, and 30-34 Composite.
As of the 2008 season, Penn State and USC have played 8 games and each has won 4 times. 1923: USC 14, Penn State 3 1982: Penn State 26, USC 10 1990: USC 19, Penn State 14 1991: USC 21, Penn State 10 1993: Penn State 21, USC 20 1994: Penn State 38, USC 14 1996: Penn State 24, USC 7 2000: USC 29, Penn State 5
Penn's 2014 25th-75th percentile ACT Math Scores are 29-34, meaning 25% of students scored 29 or lower on the ACT Math Score, and 75% of students scored 34 or lower (i.e. 25% of students scored 34 or higher).
It's not a shoe-in, but it's certainly plausible. It depends what the 3.9 GPA consists of - if most of courses are of the highest levels possible at your school, then your chances are better.
* On the ACT with writing test, a composite score of 19 is required with a minimum of 17 on the English subsection, a minimum of 19 on the math subsection and a minimum of 18 on the reading subsection.
Stanford University does not have a required score for the ACT. Their admissions is based on your GPA, courses you have taken, test scores, and other factors. However, most students have an ACT score between 29 and 34.
Your question is ambiguous. Assuming you are asking "what is the average GPA for high school students admitted to Vanderbilt Undergrad", according to collegedata.com, the average GPA for those who have applied so far for the Undergraduate class of 2015 is 4.14 weighted and 3.74 unweighted. if your question was "what is the average GPA of Vanderbilt undergrad", I believe it is around 3.2
Florida State's 2014 25th-75th percentile ACT Composite Scores are 25-29, meaning 25% of students scored 25 or lower on the ACT Composite Score, and 75% of students scored 29 or lower (i.e. 25% of students scored 29 or higher).
Michigan State's 2014 25th-75th percentile ACT English Scores are 22-29, meaning 25% of students scored 22 or lower on the ACT English Score, and 75% of students scored 29 or lower (i.e. 25% of students scored 29 or higher).
NC State's 2014 25th-75th percentile ACT Math Scores are 24-29, meaning 25% of students scored 24 or lower on the ACT Math Score, and 75% of students scored 29 or lower (i.e. 25% of students scored 29 or higher).