The median of this set of data values is 19.50.
Median can be described as the number that occurs in the middle of a set of numbers that are arranged either in ascending or descending order. Median is a measure of central tendency.
Median = 1/2 x (n + 1)
1/2 x 9 = 4.5 = (18 + 21) / 2 = 19.5
To learn more about median, please check: https://brainly.com/question/14746682
#SPJ2