A set of data is arranged in ascending order: 2, 4, 5, x, 7, 15. It is known that the median of this set of data is 6, and what is the mode of this set of data
一组数据按从小到大排列为：2，4，5，x，7，15，已知这组数据的中位数是6，这组数据的众数是多少
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">6 - (5/2)</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(7/2) / (1/2)</gadget>
<output>7</output>

<result>7</result>