7、<=0.0054系统中不存在周期性系统误差2.5①要求的概率,已知标准差=1.5经过标准正态分布变换,,,=1.8667≈1.87经过查表可知......φ(x) x 00.010.020.030.040.050.060.070.080.09x00.50.5040.5080.5120.5160.51990.52390.52790.53190.53590.10.53980.54380.54780.55170.55570.55960.56360.56750.57140.57530.20.57930.58320.5871