The average height of 10 students is 1.53 meters. Use some steps to make everyone have the same height, which is 1.71 meters. If the height of each student is different, how high is the average height of these steps?
10个学生的平均身高是1.53米，利用一些台阶，使得每个人都一般高，都是1.71米，如果每个学生的身高都不相同，那么这些台阶平均至多有多高？
<gadget id="calculator">1.71 * 10</gadget>
<output>17.1</output>

<gadget id="calculator">1.53 * 10</gadget>
<output>15.3</output>

<gadget id="calculator">17.1 - 15.3</gadget>
<output>1.8</output>

<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">1.8 / 9</gadget>
<output>0.2</output>

<result>0.2</result>