已知下列每组数据Ⅰ.8 0 6 8 10 3 2 2 80Ⅱ.5 3 3 1 57 5 9 7Ⅲ.4 5 4 120 12 0 4（1）求每组的平均数。（2）求每组的中位数。（3）求每组的众数。（4）求每组的四分位数。

A. He is taking an entrance examination.
B. He is working as an engineer.
C. He is receiving his Bachelor's degree.
D. He is at a job interview.

A. He suggests the woman keep trying until she gets it right.
B. He suggests the woman take a break.
C. He suggests he may be able to help her practise her lines.
D. He suggests that the woman give up if she is always having these problems.

A. To ask for help from advanced learners.
B. To receive assistance from the teacher.
C. To study by himself in the lab.
D. To join in the intermediate level.

A. He has been teaching in high school for a long time.
B. He is completely lost in foreign culture.
C. He thinks he will never get old.
D. He wants to keep learning all his life.