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对随机变量X和Y，已知E（X)=－2，E（Y)=2，D（X)=1，D（Y)=4，ρ（X，Y)=－0.5，则由切比雪夫不等式有P{|X＋Y|≥6}≤_______．
对随机变量X和Y，已知E(X)=-2，E(Y)=2，D(X)=1，D(Y)=4，ρ(X，Y)=-0.5，则由切比雪夫不等式有P{|X+Y|≥6}≤_______．
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