GRE数学官方指南第六章中第11题什么意思,

燕南菲2022-10-04 11:39:541条回答

GRE数学官方指南第六章中第11题什么意思,
Each of the following linear eauqtions defines y as a function of x for allintegers xfrom 1 to100.For which of the following equations is the standard deviation of the y-values corresponding to all the x-values the freatest?
a.y=x/3 b.y=x/2+40 c.y=x d.y=2x+50 e.y=3x-20

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kinli218 共回答了12个问题 | 采纳率100%
X从1到100的整数,问ABCD中哪一个是标准差最大的,greatest而不是freatest,显然选E
不需要X从哪里到哪里,方差一条性质就是D(AX)=A^2*D(X),所以X系数大的就是标准差最大的
1年前

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