CUMULATIVE PROBABILITY FOR X-N(,o2) 日Z(X-1)oX=叶+Zo 吃可平“0 30120101+0+20+3xCUMULATIVE PROBABILITY FOR X~N(μ,σ 2 )  Z=(X-μ)/σ X= μ+Zσ 20 -3 -2 -  + +2 +3 x