Xiaoqiang practices shot put and throws it 5 times. If the best result and the worst result are removed, the average result is 9.73 meters. If the best result is removed, the average result is 9.51 meters. If the worst result is removed, the average result is 9.77 meters. How many meters is the difference between Xiaoqiang's best grade and his worst grade?
小强练习掷铅球，投了5次，去掉一个最好成绩和一个最差成绩，则平均成绩为9.73米，去掉一个最好成绩，则平均成绩为9.51米，去掉一个最差成绩，则平均成绩为9.77米．小强最好成绩与最差成绩相差多少米．
<gadget id="calculator">9.77 * 4</gadget>
<output>39.08</output>

<gadget id="calculator">9.51 * 4</gadget>
<output>38.04</output>

<gadget id="calculator">39.08 - 38.04</gadget>
<output>1.04</output>

<result>1.04</result>