A poll asks shoppers at the mall how many cups of water they typically drink in a day. The results of the poll are listed. 3, 5, 5, 6, 6, 6, 7, 7, 8, 8, 8, 8, 8, 8, 9, 9, 10, 10, 10, 10, 11 What is value of the first quartile?