若X是离散型随机变量,则E(X-EX)的值 A E(X) B 0 C (E(X))^2 D 2E(x)
问题描述:
若X是离散型随机变量,则E(X-EX)的值 A E(X) B 0 C (E(X))^2 D 2E(x)
答
b E(X-EX)=EX-E(EX)=EX-EX=0
若X是离散型随机变量,则E(X-EX)的值 A E(X) B 0 C (E(X))^2 D 2E(x)
b E(X-EX)=EX-E(EX)=EX-EX=0