University of Colorado
University of Colorado: Normal Probabilities Applet #3
The Applet illustrates how to use the old-fashioned tables of normal probabilities and areas under the normal distribution cureve to arrive at corresponding graphs of the areas. A good resource for the topic.
Palomar Community College District
Palomar College: The Normal Curve an Example
A collection of step-by-step worked problems demonstrating how to take a normal curve and determine the probability (area) under it. Hints are provided along the way and the final measures are shown for the user to check.