Answer
0.210
Work Step by Step
Write the list in sorted order and find the item(s) in the center of the list.
$0.018, 0.052, 0.115, 0.189, 0.196, \underset\uparrow0.198, \underset\uparrow0.222, 0.228, 0.258, 0.337, 0.346, 0.532$
Since this set contains an even number of items, find the mean of the 2 center items to determine the median.
$\frac{0.198+0.222}{2}=\frac{0.420}{2}=0.210$
