麻烦大家帮我解答一下这道GRE数学题
麻烦大家帮我解答一下这道GRE数学题
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