Given that the average of the data 8, x, 6, and 4 is 6, what is the median of this group of data?
已知数据8，x，6，4的平均数是6，则这组数据的中位数是多少．
<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<gadget id="calculator">8 + 6 + 4</gadget>
<output>18</output>

<gadget id="calculator">24 - 18</gadget>
<output>6</output>

<gadget id="calculator">6 + 6</gadget>
<output>12</output>

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<result>6</result>