A set of sample data is arranged from small to large: 13, 14, 19, x, 23, 27, 28, 31, where the median is 22, then x=what
一组样本数据从小到大排列为：13，14，19，x，23，27，28，31，其中中位数为22，则x=多少
<gadget id="calculator">22 * 2</gadget>
<output>44</output>

<gadget id="calculator">44 - 23</gadget>
<output>21</output>

<result>21</result>