Khan/khan-exercises — Issue #13674: Variance - Repeat Performance
Author: KhanBugz
Created: 2012-02-12 14:22:27+00:00
State: open
Labels: chrome, other, vista

I already completed this module, but since it was moved, all of my progress has been erased. I'm pretty sure this has happened with at least one other module, and it also erased the time I spent on it from my activity and possibly also the points I earned from it. You may need to tweak your system to stop it from removing past work when you make a change.

[variance.html?seed=112&problem=population](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/variance.html?seed=112&problem=population&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/variance.html?seed=112&problem=population&debug&activity=%5B%5D)

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Mozilla/5.0 (Windows NT 6.0; WOW64) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.874.121 Safari/535.2

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