问题如下图:
这个公式讲义中在哪里讲过
NO.PZ2020010304000005 问题如下 Whis the effeon the covarianbetween X1 anX2 of rescaling X1 w anX2 (1 - w), where w is between 0 an1? Use the properties of rescalecovariance, Cov[wX1, (1 - w)X2] = w(1 - w)Cov[X1, X2]. 可以翻译下吗
NO.PZ2020010304000005 这道题的解题思路是不是把常数提取出来?