Site has a program where you can input data values and it will calculate the mean, standard deviation, or plot data on a histogram.
WebMath

6th grade math knowledge map info
StudyStack

This provides detailed explanations about working with Line Graphs, Pie Charts, mean, median and mode.
Math League

The Continuous Compound Interest Formula and an example with its solution
College Algebra Tutorial

This site helps with the concept of transformations
Math is Fun

Goes over collecting and organizing data into frequency tables, histograms, box and whisker plots, and stemandleaf plots. Also shows finding mean, median and mode. Many include videos!
Online Math Learning

A simple treatment of how to generate a stemandleaf plot from a set of data.
North Michigan University

Describes in detail the process of generating a boxandwhicker plot from a set of data.
North Michigan University

Description of direct variation and the constant of variation; with a graph and related question
Oswego City School District Regents Exam Prep Center

Using and Handling Data
Math is Fun
