当然是64C^2了啥,不管他是什么随机变量都是这样的:
本身扩大了n倍,那么期望也要扩大n倍,方差则要扩大n^2倍!
关于随机变量方差的问题?
关于随机变量方差的问题?
假设A是正态分布的随机变量,期望为U,方差为C^2,那么8A的期望为8U,方差为多少?是64C^2,还是8C^2?
假设A是正态分布的随机变量,期望为U,方差为C^2,那么8A的期望为8U,方差为多少?是64C^2,还是8C^2?
数学人气:460 ℃时间:2020-03-29 09:58:21
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