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试卷名称:GRE（QUANTITATIVE）综合模拟试卷18

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Each of the following linear equations defines y as a function of x for all integers x from 1 to 100. For which of the following equations is the standard deviation of the y-values corresponding to all the x-values the greatest?

A．y=x/3

B．y = x/2+ 40

C．y = x

D．y = 2x + 50

E．y = 3x-20

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