朴实无华
春芽
共回答了16个问题采纳率:87.5% 举报
1、样本均值服从N(12,0.8)
P(|样本均值-12|>1)=P(|样本均值-12|/根号0.8>根号5/2)=2F(1.118)-1
=0.7698
2、P{max{ X1,X2,X3,X4,X5}>15}
=1-P{max{ X1,X2,X3,X4,X5}≤15}
=1-[P(X≤15)]^5
=1-[P(X-12)/2≤1.5)]^5
=1-F(1.5)^5
1-0.9332^5=0.3023;
P{min{ X1,X2,X3,X4,X5}
1年前
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