Question: what is the enrollment at ball state university
[{'answer': '22,513 students', 'provenance': [{'wikipedia_id': '390375', 'title': 'Ball State University', 'start_paragraph_id': 2, 'start_character': 163, 'end_paragraph_id': 2, 'end_character': 178, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]