P (-1<Z<+1) = P(μ±1σ)= .6826 P(-2<Z<+2) = P(μ±2σ)= .9544 P(-3<Z<+3) = P(μ±3σ)= .9974 其中Excel提供常態分配表的函數-NORMSDIST,若知道Z值則可 ...
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