2. The owner of an antique shop recorded the number of customers who came in to his store every day in 15 days. The results were: 21, 16, 26, 12, 18, 21, 20, 11, 29, 16, 17, 20, 15, 11, and 10. What are the values of the upper quartile, ninth decile and fiftieth percentile? Q3=, Q9=, Q50=​