3.9有人调查了465位篮球运动员某年的收入，发现他们的年收入以24.7万元为分布中心，但超过24.7万元的只有121人。试问这里的24.7万元指的是哪一种集中趋势值？球员收入分布呈什么形态？为什么？
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某市场上有三种价格的香蕉，每千克分别为4、6、10元，试计算：（1）各买十元钱，平均每千克多少钱？（2）各买一千克，平均每千克多少钱？
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。
[音频]Q：What's the man doing?
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.
[音频]Q： What does the man suggest the woman do ?
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.
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