Answer:
14
Step-by-step explanation:
median is the number in the very middle when the numbers are organized in order:
1, 2, 7, 13, 14, 17, 18, 18, 20
if we start taking away from both ends we’ll get the answer
2, 7, 13, 14, 17, 18, 18
7, 13, 14, 17, 18
13, 14, 17
14