Exploring the Tails of the Normal Distribution

This Demonstration allows you to estimate the area under the tails of the normal distribution curve. Reading the value of the cumulative distribution function (orange curve) for a specific value gives the area under the probability distribution function (blue curve) to the left (for the lower tail) or to the right (upper tail) of the value. The probability distribution function can be adjusted to have values for the mean and standard deviation in the ranges (-10, 10) and (0.1, 15), respectively.