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版选修2_3.ppt

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,第二章 随机变量及其分布,24 正态分布,第二章 随机变量及其分布,正态分布密度曲线,N(，z2),XN(，2),上方,不相交,x,x,1,越小,集中,越大,分散,0.6827,0.9545,0.9973,

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