41.2标准正态分布p58-60 P(-1.67sZ≤167)=0.905 0.0475 0.0475 1.67 1.67 F(Z) P(Zs1.67)=0.9525 16723 4-7 Fig 4-3 (a)PDF and (b )CDF of the standard normal variable4-7 4.1.2 标准正态分布p58-60 Fig 4-3 (a) PDF and (b) CDF of the standard normal variable