I can see now that this is my fault, as I was passing the x and ylab parameters each time, but I can’t see why these don’t overlay perfectly?
The commands to generate the plot were
plot(function(x)dnorm(x,100,15)*100, 50, 150, main = "IQ distribution", xlab = "IQ", ylab = "proportion")
par(new=TRUE)
plot(function(x)dnorm(x,100-15,15)*100, 50, 150, main = "IQ distribution", xlab = "IQ", ylab = "proportion")
par(new=TRUE)
plot(function(x)dnorm(x,100+15,15)*100, 50, 150, main = "IQ distribution", xlab = "IQ", ylab = "proportion")
norm.pdf
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