Khan/khan-exercises — Issue #12256: Standard deviation - Standard Deviation Not Correct
Author: KhanBugz
Created: 2012-01-27 04:03:05+00:00
State: open
Labels: leopard, safari, wrong-or-unclear

Reporter: jake.c.dailey@gmail.com

In this problem, the variance should be divided by 5 instead of 6. The standard deviation should be 6.4 (rounded) instead of 5.8.

[standard_deviation.html?seed=89&problem=population](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/standard_deviation.html?seed=89&problem=population&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/standard_deviation.html?seed=89&problem=population&debug&activity=%5B%5B%22incorrect-activity%22%2C%22%5B%5C%226.83%5C%22%2C%5C%226.37%5C%22%5D%22%2C511%5D%2C%5B%22hint-activity%22%2C%220%22%2C3%5D%2C%5B%22hint-activity%22%2C%220%22%2C4%5D%2C%5B%22hint-activity%22%2C%220%22%2C5%5D%2C%5B%22hint-activity%22%2C%220%22%2C9%5D%2C%5B%22hint-activity%22%2C%220%22%2C24%5D%2C%5B%22hint-activity%22%2C%220%22%2C25%5D%2C%5B%22hint-activity%22%2C%220%22%2C25%5D%2C%5B%22hint-activity%22%2C%220%22%2C25%5D%2C%5B%22hint-activity%22%2C%220%22%2C27%5D%2C%5B%22hint-activity%22%2C%220%22%2C28%5D%2C%5B%22correct-activity%22%2C%22%5B%5C%226.8%5C%22%2C%5C%225.8%5C%22%5D%22%2C64%5D%5D)

[["6.83","6.37"],["6.8","5.8"]]

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_5_8) AppleWebKit/534.50.2 (KHTML, like Gecko) Version/5.0.6 Safari/533.22.3

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