神马作文网GMAT数学题~关于标准方差
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GMAT数学题~关于标准方差
The arithmetic mean of a data set is 46 and the standard deviation of the set is 4.
Which value is exactly 1.5 standard deviations from the arithmetic mean of the set?
现在在复习~怎么也想不起来当初是怎么算出这个答案的了 0 0
我是想知道解题思路。
The arithmetic mean of a data set is 46 and the standard deviation of the set is 4.
Which value is exactly 1.5 standard deviations from the arithmetic mean of the set?
现在在复习~怎么也想不起来当初是怎么算出这个答案的了 0 0
我是想知道解题思路。
整组数的平均数Xbar=46
方差= {sum[(x1-Xbar)^2]}^1/2/n = 4
[(x-46)^2] ^1/2= 6
(x-46)^2=36
x-46=6
x=52
方差= {sum[(x1-Xbar)^2]}^1/2/n = 4
[(x-46)^2] ^1/2= 6
(x-46)^2=36
x-46=6
x=52