Khan Academy on a Stick
Exploring standard deviation 1 module
Ben Eater and Sal Khan talk through the Khan Academy Standard Deviation 1 Module: http://www.khanacademy.org/math/statistics/e/exploring_standard_deviation_1
The video could not be loaded, either because the server or network failed or because the format is not supported.
If the above player doesn't work, try this direct link.