#pnorm函數的使用形式：pnorm(p,mean=0,sd=1,lower.tail=TRUE,log.p=FALSE)

#a.P(X>=2)

pnorm(2,mean=2,sd=3,lower.tail=FALSE)

#b.P(1<=X<7)

pnorm(7,mean=2,sd=3,lower.tail=TRUE)-pnorm(1,mean=2,sd=3,lower.tail=TRUE)

#c.P(-2.5<=X<-1)

pnorm(-1,mean=2,sd=3,lower.tail=TRUE)-pnorm(-2.5,mean=2,sd=3,lower.tail=TRUE)

#d.P(-3<=X-2<3)即P(-1<=X<5)

pnorm(5,mean=2,sd=3,lower.tail=TRUE)-pnorm(-1,mean=2,sd=3,lower.tail=TRUE)

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