Count the number of people who graduated from universities affiliated with the NCAA.
SELECT DISTINCT COUNT(?uri) WHERE { ?x <http://dbpedia.org/ontology/athletics> <http://dbpedia.org/resource/National_Collegiate_Athletic_Association> . ?uri <http://dbpedia.org/property/education> ?x  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Person>}
National_Collegiate_Athletic_Association