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据魔方格专家权威分析试题“巳知随机变量ξ服从正态分布N(1,δ2)(δ>0).若ξ在(01)内取值的概..”主要考查你对 正态分布 等考点的理解。关于这些考点的“档案”如下:
现在没空点击收藏,以后再看
正态曲线,x∈R的有关性质:
(1)曲线在x轴上方与x轴永不相交;
(2)曲线关于直线x=μ对称,且在x=μ两旁延伸时无限接近x轴;
(3)曲线在x=μ处达到最高点;
(4)当μ一定时,曲线形状由σ的大小来决定,σ越大,曲线越“矮胖”表示总体分布比较离散,σ越小,曲线越“瘦高”,表示总体分布比较集中。
在标准正态总体N(01)中:
(2)(因为曲线关于y轴对称);
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