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标题: 天山4-Q24: [打印本页]

作者: kanstorys    时间: 2007-6-15 07:01     标题: 天山4-Q24:

Factor Percent of Respondents

User-friendly 56%

Fast response time 48%

Bargain prices 42%

The table gives three factors to be considered when choosing an Internet service provider and the percent of the 1,200 respondents to a survey who cited that factor as important. If 30 percent of the respondents cited both “user-friendly” and “fast response time,” what is the maximum possible number of respondents who cited “bargain prices,” but neither “user-friendly” nor “fast response time?”

A. 312

B. 336

C. 360

D. 384

E. 420

我想问一下,为什么不能以42-26-18这么做。


作者: aprilhuang    时间: 2007-6-15 20:22

A吧?

此题问最多

我是这么做的,实际有7种情况:单U,单F,单B,单UF,单UB,单FB,UFB

求单B的最大值

单B=1200*(1-单U-单F-单UF-单UB-单FB-UFB)

其中单U+单UB+单UF+UFB=56%

    单F+单UF+单FB+UFB=48%

单UF+UFB=30%

因为求单B的最大值,所以假定单UB,单FB,单UF都为0

单B=1200*(1-单U-单F+UFB)

   =1200*(1-56%-48%+30%)=312


作者: kanstorys    时间: 2007-6-16 22:06

QUOTE:
以下是引用aprilhuang在2007-6-15 20:22:00的发言:

A吧?

此题问最多

我是这么做的,实际有7种情况:单U,单F,单B,单UF,单UB,单FB,UFB

求单B的最大值

单B=1200*(1-单U-单F-单UF-单UB-单FB-UFB)

其中单U+单UB+单UF+UFB=56%

    单F+单UF+单FB+UFB=48%

单UF+UFB=30%

因为求单B的最大值,所以假定单UB,单FB,单UF都为0

单B=1200*(1-单U-单F+UFB)

   =1200*(1-56%-48%+30%)=312

谢谢!明白了。






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