My input 'How many high school students are there in the USA in 2012' gets a perfect result. (17.28 million) Under 'Input interpretation' I see that 'high school students was translated into 'grade 9 to 12' - perfect! When however I put in 'How many grade 12 students are there in the USA in 2012', Wolfram Alpha gets very confused. Why? What should I ask?
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