[Probability and Statistics] Which of the following is the correct shape of the graph of the function representing the median according to the value of $x$ in the following data? (where $x \geqq 0$ ) [3 points]\\
$10 , \quad 28 , \quad x , \quad 20 , \quad 8 , \quad 2 , \quad 25 , \quad 7 , \quad 17$