Need some help reproducing a graph

<http://r.789695.n4.nabble.com/file/n4645492/graph.jpg> 


I need to replicate this graph. It is a simple normal distribution-curve
with mean 90 and sd=10. The vertical bars is the 95% confidence limit of the
mean. How on earth do I add those confidence limits? 

Im thinking something that has to do with:

c(0.025,0.975)

But I really dont know :S