It is known that the mean of a set of data x, 5, 3, 0 is 4, then what is its median.
已知一组数据x，5，3，0的平均数是4，那么它的中位数是多少．
<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<result>4</result>