— I have a .
— Maybe you should see a dentist.
A:cold
B:stomachache
C:headache
D:toothache
90 81 55 62 70 78 94 88 97 86 100 66 75 85
请根据上面的分数填写下表,(从左到右填写)并回答几个问题:
①该小组的平均成绩是多少分;
②优秀率(指80分以上)是几%;
③及格率是几%;
④不及格率是几%;