McGraw Hill
Glencoe: Self Check Quizzes 1 Frequency Tables
Use Glencoe's randomly generated self-checking quiz to test your knowledge of frequency tables. Each question has a "Hint" link to help. Choose the correct answer for each problem. At the bottom of the page click the "Check It" button...
Missouri State University
Missouri State University: Introductory Statistics: Models of Distributions
The different types of distributions are discussed here - uniform, regular, negative exponential, triangular, and normal. The properties of probability distributions are also explained here in detail. A good starting point in the topic...
Other
West Virginia University: Normal Distribution
The history of the normal curve and its use in statistics is presented. An Applet is provided for the user to adjust the left and right edges of the probability and see the effect on the area under the curve.