Estimation: Size Total US High School Enrollment in Grades 9 to 12

Estimate how many students are enrolled in high schools across the United States. ```hint Anchor on one grade Size a single grade or one year of age first, then decide what to add or subtract to turn people of the right age into enrolled students. ``` ### Clarifying Questions - Does high school mean grades 9 through 12, as in most US districts, or a different span? - Should private, charter and online schools count, and should homeschooled teenagers be included? - Do you want a point-in-time count for the current school year, and does it cover only the 50 states and Washington, D.C., or the territories too? ### What a Strong Answer Covers - A clear definition of who counts (grades, school types, homeschooling, geography) settled before any arithmetic - A transparent equation whose inputs are each labeled as assumptions and rounded for mental math - Correct arithmetic, including the adjustment from people of high school age to enrolled students - A sanity check, ideally a second independent method, and a note on which input the answer is most sensitive to ### Follow-up Questions - Re-estimate the number from the supply side, starting from how many high schools there are. - How would you change the estimate to count only seniors planning to apply to a four-year college this year? - If a product launch depended on this number, which assumption would you verify first, and how?