18 is.
21 + 17 + 16 = 54 And there are three numbers so average = 54/3 = 18
Order them: 15 16 17 21 21 Find the middle one: 17 That is the median
16+17+21+15+139=208
the median for 16,16,16,16,16,16,16,16,17,17,17,17,17,17,18,18,18,20,21,25 is 17
19
The average is 15.
Average = 20
16
2 and 17
16/19
As of 2008, she is 21 years old