It is known that a set of data is 0, 1, 4, a, 6, 13, and the median of this set of data is 5, then what is the average of this set of data
已知一组数据为0、1、4、a、6、13，这组数据的中位数是5，那么这组数据的平均数是多少
<gadget id="calculator">0 + 1 + 4 + 6 + 6 + 13</gadget>
<output>30</output>

<gadget id="calculator">30 / 6</gadget>
<output>5</output>

<result>5</result>