In a mathematics competition, the test scores of a group of students in a certain class are: 70, 72, 70, 85, 90, 92, 70, 75, 85, 85, 81, 85. What is the average score of their mathematics competition? ?
一次数学竞赛中，某班的一个组同学的考试成绩分别为：70、72、70、85、90、92、70、75、85、85、81、85，他们数学竞赛的平均成绩是多少分？
<gadget id="calculator">70 + 72 + 70 + 85 + 90 + 92 + 70 + 75 + 85 + 85 + 81 + 85</gadget>
<output>960</output>

<gadget id="calculator">960 / 12</gadget>
<output>80</output>

<result>80</result>