设随机变量X有期望E(X)与方差D(X)则对任意正数ε，有()

设随机变量X有期望E(X)与方差D(X)则对任意正数ε，有()

A、P(∣X-E(X)∣﹤ε)=D(X)/ε²
B、P(∣X-E(X)∣﹤ε)﹥D(X)/ε²
C、P(∣X-E(X)∣≥ε)≤1-D(X)/ε²
D、P{}∣X-E(X)∣≥ε}≤D(X)/ε²
【正确答案】：D
【题目解析】：有切比雪夫定理，可得P{}∣X-E(X)∣≥ε}≤D(X)/ε²