The typical AVERAGE function that can be used to determine the average number of years of post-secondary education of all students is "AVERAGE(StudentRepresentatives[Post-Secondary Years])".
In a spreadsheet, the AVERAGE function is used to find the normal average of a list of data, such as the total list of population.
In conclusion, the function "AVERAGE(StudentRepresentatives[Post-Secondary Years])" will be used to determine the average number of years.
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