Khan/khan-exercises — Issue #12115: Standard deviation - figuring
Author: KhanBugz
Created: 2012-01-25 20:08:04+00:00
State: open
Labels: ie8, other, xp

Reporter: familymischief@gmail.com

the figuring on the last part of the soluting is completly unclear mathematically and logically

[standard_deviation.html?seed=117&problem=sample](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/standard_deviation.html?seed=117&problem=sample&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/standard_deviation.html?seed=117&problem=sample&debug&activity=%5B%5B%22incorrect-activity%22%2C%22%5B%5C%2217%5C%22%2C%5C%2220%5C%22%5D%22%2C347%5D%2C%5B%22hint-activity%22%2C%220%22%2C9%5D%2C%5B%22hint-activity%22%2C%220%22%2C10%5D%2C%5B%22hint-activity%22%2C%220%22%2C11%5D%2C%5B%22hint-activity%22%2C%220%22%2C14%5D%2C%5B%22hint-activity%22%2C%220%22%2C19%5D%2C%5B%22hint-activity%22%2C%220%22%2C42%5D%2C%5B%22hint-activity%22%2C%220%22%2C51%5D%2C%5B%22hint-activity%22%2C%220%22%2C54%5D%2C%5B%22hint-activity%22%2C%220%22%2C57%5D%2C%5B%22hint-activity%22%2C%220%22%2C62%5D%2C%5B%22hint-activity%22%2C%220%22%2C69%5D%5D)

[["17","20"]]

Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; HotbarSearchToolbar 1.1; EasyBits GO v1.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; InfoPath.2; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)

MathJax is loaded, ready, queue length: 0