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设随机变量X的数学期望E(X)=μ,方差D(X)=σ
2
,则根据切比雪夫不等式估计P{∣X-μ∣﹤kσ}≥____.
分类:
概率论与数理统计(经管类)(04183)
发表:2024年09月12日 09时09分51秒
作者:
admin
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(26)
设随机变量X的数学期望E(X)=μ,方差D(X)=σ
2
,则根据切比雪夫不等式估计P{∣X-μ∣﹤kσ}≥____.
【正确答案】:1-1/k
2
。解析:令ε=kσ,由切比雪夫不等式p{∣X-E(X)∣≥ε)≤D(X)/ε
2
有p{∣X-μ∣﹤kσ)=1-p{∣X-μμ≥kσ)≥1-σ
2
/(kσ)
2
=1-1/k
2
.
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