题目
设随机变量 X sim N(2,16)，则下式中不成立的是().A. EX = 2B. DX = 4C. PX = 16 = 0D. PX leq 2 = 0.5
设随机变量 $X \sim N(2,16)$，则下式中不成立的是().
A. $EX = 2$
B. $DX = 4$
C. $P\{X = 16\} = 0$
D. $P\{X \leq 2\} = 0.5$
题目解答
答案
B. $DX = 4$
A. $EX = 2$
B. $DX = 4$
C. $P\{X = 16\} = 0$
D. $P\{X \leq 2\} = 0.5$