用曲线函数在X轴上标记均值

Question

我希望均值出现在 X 轴上。我只设法让它出现，但在 X 轴上方。

curve(dnorm(x, mean=mu, sd=s), from = 0, to = 80, xlab="Horas", ylab="f(x)")
abline(v=mu, col='red', lty=3)
abline(v=mu-(s/2), col='blue', lty=3)
abline(v=mu+(s/2), col='blue', lty=3)
legend("topright", legend = c("", ""), 
       title = (paste("N(",mu,",",s,")")),
      title.adj = 0, lty = 0, lwd = 0, box.lty = 0 )
text(mu, 0, labels=mu)
box()