A math test, a group of 8 people, their average score is 82.5 points. After the examination papers were handed out, the group leader Li Li found that the teacher had made a mistake in marking a question, so Li Li's grade dropped by 4 points. What is the average score of the whole group now?
一次数学测验，某小组共8人，他们的平均成绩是82.5分．考卷发下后，小组长李丽发现老师批错一题，这样李丽的成绩下降了4分，现在全小组平均分是多少分．
<gadget id="calculator">4 / 8</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">82.5 - (1/2)</gadget>
<output>82</output>

<result>82</result>