p1=P{X<=u-2}=P{(X-u)/2<=-1}=Phi(-1)=1-Phi(1)p2=P{Y>=u+5}=1-P{Y所以对任意u都竖运有p1=p2,选A注:(1)将隐纤帆正态分布标准灶雹化;(2)Phi是希腊字母fai.
A