What is the median in the group of numbers 7.2, 10.1, 15.5, 4.6, 4.5, and 6.9?
7.2，10.1，15.5，4.6，4.5，6.9这组数中的中位数是多少．
<gadget id="calculator">6.9 + 7.2</gadget>
<output>14.1</output>

<gadget id="calculator">14.1 / 2</gadget>
<output>7.05</output>

<result>7.05</result>