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。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
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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