Use this page to visualize normally distributed pdf
You can also find, approximately, what is the area under the curve between any two points.
Enter the the value for the mean, `mu` (between -4 and 4) and for the standard deviation, `sigma` (between `frac{1}{2}` and 4):
The normal distribution is given by the following pdf: `frac{1}{sigma sqrt{2 pi}}e^{frac{-1}{2} (frac{x- mu}{sigma})^2}`