The following is the number of books read by several students in one semester: 5, 5, 8, 9, 10, 13, 30, 40. It is more appropriate to use the median to represent the reading level of these students.
下面是几位同学一学期内读书本数：5、5、8、9、10、13、30、40，用中位数多少代表这几位同学的读书水平比较合适．
<gadget id="calculator">9 + 10</gadget>
<output>19</output>

<gadget id="calculator">19 / 2</gadget>
<output>19/2 = around 9.5</output>

<result>19/2 = around 9.5</result>