What SAT score do you need to be in the top 20% of the population?
http://professionals.collegeboard.com/profdownload/sat-percentile-ranks-2010.pdf
http://collegestats.org/articles/2010/02/the-ultimate-guide-to-sat-test-statistics/
Maybe this link will help answer your question.
http://satteststudy.com/average-sat-score/
To determine the SAT score required to be in the top 20% of the population, you would need to refer to the percentile ranks provided by the College Board, the organization that administers the SAT. These percentile rankings represent the percentage of test takers who scored lower than a particular score.
1. Locate the percentile ranks: The College Board provides a table that correlates SAT scores with percentile ranks. You can find this table on their website or in official SAT study resources.
2. Identify the top 20%: You want to determine the score that approximately 20% of test takers scored below. In percentile terms, this means you need to find the score that corresponds to the 80th percentile.
3. Interpolate or round: Based on the percentile ranks table, locate the SAT score closest to the 80th percentile. You can either estimate based on the table or interpolate between two given values to get a more precise estimate.
Remember that the exact SAT score required to be in the top 20% can vary from year to year, as it depends on the performance of the test-taking population. Always consult the most up-to-date information provided by the College Board for accurate percentile rankings.