In this interactive figure you can experiment with the normal probability density function with mean [math]\mu[/math] and standard deviation [math]\sigma[/math]. You can vary the mean or the standard deviation by moving the two points on the [i][math]x[/math][/i]-axis. This figure also demonstrates the probability within n standard deviations of the mean, which you can vary by using the slider for [i][math]n[/math][/i].

[i]Developed for use with Thomas' Calculus, published by Pearson.[/i]