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fcheng025: ½ð±Ò+5, ¡ï¡ï¡ïºÜÓаïÖú 2016-08-08 10:27:06
E(|X|^2)=D(X)+E(X)^2=0.2
P(-1<X<1.1)>=P(|X|<1.1)=1-P(|X|>=1.1),
ÀûÓÃChebyshev¡¯s inequality,
P(|X|>=1.1)<=1/(1.1^2)E(|X|^2)<=0.2/1.21ԼΪ0.165,
ÔòP(-1<X<1.1)>=1-0.165=0.835
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