求助，一道寂静+PREP---1

alicejingli · 发表于 2010-12-23 12:51:28

28. 一个是一个国家的缝纫机产量1990年时0.8m
，每年增长百分比一定，2000年时候这些年总销量14.3，求百分比
<v2> 一个是国家的缝纫机产量 1990年时0.8m
，每年增长百分比一定，2000年时候这些年总销量14.3，求这些年其中两年销量差最大的range。做法：我是按照等差数列的做法来做的，每年的增长是0.1，2000年的销量是8.8+1.0=9.8，90年的销量是8.8，因此最大range应该是1.0.

我想问90年销量8。8是怎样计算的？

还有Last month 15 homes were sold in Town X. The arithmetic mean sale price of the homes is $150,000 and the median price was $130,000. Which of the following statements must be true?

I. At least one of the homes was sold for more than $165,000

II. At least one of the homes was sold for more than $130,000 and less than $150,000

III. At least oe of the homes was sold for less than $130,000.

Answer choices

I only

II only

III only

I and II

I and III
我觉得I， III都可以，可答案是i ，求助这道题的思路是啥？平均数与中值之间有等量关系吗？

请说得越具体越好。。。

Last month 15 homes were sold in Town X. The arithmetic mean sale price of the homes is $150,000 and the median price was $130,000. Which of the following statements must be true?

I. At least one of the homes was sold for more than $165,000

II. At least one of the homes was sold for more than $130,000 and less than $150,000

III. At least oe of the homes was sold for less than $130,000.

Answer choices

I only

II only

III only

I and II

I and III
我觉得I， III都可以，可答案是i ，求助这道题的思路是啥？平均数与中值之间有等量关系吗？

请说得越具体越好。。。

lbccd · 发表于 2010-12-23 15:35:11

3可以是好多好多好多的$130,000...

alicejingli · 发表于 2010-12-23 17:03:35

? 求助

alicejingli · 发表于 2010-12-23 17:39:53

不要沉，继续顶，求助

求助，一道寂静+PREP---1

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