Answer
12.8
Work Step by Step
Write the list in sorted order and find the item(s) in the center of the list.
$2.7, 7.2, 8.1, 9.3, 10.6, 10.9, 11.4, \underset\uparrow12.7, \underset\uparrow12.9, 13.5, 15.9, 16.1, 20.7, 21.9, 30.6, 42.9$
Since this set contains an even number of items, find the mean of the 2 center items to determine the median.
$\frac{12.7+12.9}{2}=\frac{25.6}{2}=12.8$