设随机变量X的数学期望E(X)=μ,方差D(X)=σ2,则根据切比雪夫不等式估计P{∣X-μ∣﹤kσ}≥____.
1-1/k2。解析:令ε=kσ,由切比雪夫不等式p{∣X-E(X)∣≥ε)≤D(X)/ε2有p{∣X-μ∣﹤kσ)=1-p{∣X-μμ≥kσ)≥1-σ2/(kσ)2=1-1/k2.
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