Among 78, 83, 72, 36, 91, 81, 72, 86, what is the median.
在78、83、72、36、91、81、72、86中，中位数是多少．
<gadget id="calculator">81 + 78</gadget>
<output>159</output>

<gadget id="calculator">159 / 2</gadget>
<output>159/2 = around 79.5</output>

<result>159/2 = around 79.5</result>