27, 19, 20, 18, 22, 23 What is the median of this set of data
27，19，20，18，22，23这组数据的中位数是多少
<gadget id="calculator">20 + 22</gadget>
<output>42</output>

<gadget id="calculator">42 / 2</gadget>
<output>21</output>

<result>21</result>