Question

这道高数题怎么做？

第六题

Answer 1

6、DX=EX²-(EX)²，则(EX)²=EX²-DX=1.1-0.1=1 得 EX=1

根据切比谢夫不等式，有P(0＜X＜2)=P(|X-1|<1)≥1-DX/1²=1-0.1=0.9

选 C

Answer 2

E(X^2)=1.1
D(X)=0.1
D(X) = E(X^2)-[E(X)]^2
0.1 = 1.1 -[E(X)]^2
E(X) =1
ans :C