That is a good question
First:
order them
11 6 19 14 21 7 13 15 15
6Â Â 7Â Â 11Â 13Â 14Â 15Â 15Â Â 19Â Â 21
min=6
max=21
median=14
Q1=median of {6Â Â 7Â Â 11Â 13}
Q1=9
Q3=median of{15Â 15Â Â 19Â Â 21}
Q3=17
The graph satisfies these is the first plot..
I hope I helped
you.