Question: what dataset statistics are provided?
Answer: More than 2,100 texts were paired with 15 questions each, resulting in a total number of approx. 32,000 annotated questions. 13% of the questions are not answerable.  Out of the answerable questions, 10,160 could be answered from the text directly (text-based) and 3,914 questions required the use of commonsense knowledge (script-based).  The final dataset comprises 13,939 questions, 3,827 of which require commonsense knowledge (i.e. 27.4%).
Alternative answer: Distribution of category labels, number of answerable-not answerable questions, number of text-based and script-based questions, average text, question, and answer length, number of questions per text