I’m not sure how your class works, but usually if they are circled it means you only have to do the circled ones. GCF always stands for greatest common factor
Sort the numbers in ascending or descending order, then eliminate the greatest and least numbers until you're left with the middle two. The median is the average of the last two numbers.
For example, the median for the set

is 3 because the middle two numbers are 2 and 4, and their average is

.
Exact Form:
x = 0 , −6/5
Decimal Form:
x = 0 , − 1.2
Mixed Number Form:
x = 0 , − 1 1/5