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Finding of a survey of a Systems magazine subscribes: 30 percent of all merchandise orders played by Subscribes in response to advertisement in the magazine that last year were placed by subscribers under age 35.
Finding of a survey of advertisers in Systems magazine: Most of the merchandise orders placed in response to advertisement in systems last year were played by people under 35.
For both of finding to be accurate, which of the following must be true ?
A. More subscribes to System who have never ordered merchandise in response to advertisements in the magazine are age 35 or over than are under 35.
B. Among subscribers to System, the proportion who are under age 35 was considering lower last year than it is now.
C. Most merchandise orders placed in response to advertisements in System last year were placed by System subscribers over age 35.
D. Last year, the average dollar amount of merchandise orders placed was less for subscribers under age 35 than for those 35 or over.
E. Last year many people who placed orders for merchandise in response to ads in System were not subscribers to the magazine.
这题我没读懂，大家帮我解释一下为什么选E啊？
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发表于 2010-9-8 14:29:50
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