Question: mean mode and median are measures of what
[{'answer': 'central tendency', 'provenance': [{'wikipedia_id': '5794', 'title': 'Central tendency', 'start_paragraph_id': 1, 'start_character': 17, 'end_paragraph_id': 1, 'end_character': 33, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '5794', 'title': 'Central tendency', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 357, 'bleu_score': 0.965203995518735, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4180314957300566326}, 'section': 'Section::::Abstract.'}]}]