What mean starting age is at the 35 th percentile?

Use the data in "TNSchools" (https://openstax.org/r/Chapter8 Data-Sets), which has data on many institutions of higher education in the state of Tennessee. Here are what the columns represent:

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Column Name AdmRate Description Proportion of applicants that are admitted Number of undergraduate students UGEnr PTUG Proportion of undergraduates who attend part-time InState Tuition and fees for in-state students OutState Tuition and fees for out-of-state students FacSal Mean monthly faculty salary Proportion of students receiving Pell Grants Pell MedDebt Median student loan debt at degree completion StartAge Mean age at the time of entry Female Proportion of students who identify as female