What is median, first quartile, and third quartile?

well, for the median you need to put those numbers in order smallest to highest and then you count inwards from both ends. The number where counting from both ends "meets" is the median. for example, in 2, 4, 6, 8, 12, 14, 16, 18, 19 the median is 12. I don't know about the other stuff. I ume the first quartile is the number that is 1/4 of the total amount of numbers and the third quartile is 3/4 of it. (I mean the position in the order)