If 11 students stand in a row, what is the probability that one of them is standing in the middle?
11个同学站成一排，其中一个同学恰好站在中间的可能性是多少．
<gadget id="calculator">1 / 11</gadget>
<output>1/11 = around 0.090909</output>

<result>1/11 = around 0.090909</result>