Khan/khan-exercises — Issue #12049: Standard deviation - Rounding Problem
Author: KhanBugz
Created: 2012-01-25 02:09:13+00:00
State: open
Labels: firefox, snowleo, wrong-or-unclear

Reporter: cjstepney@hotmail.com

The question asks us to "round to the nearest tenth." In school we are taught not to round at all until the final answer, however it seems the answers are rounded at unpredictable points during the process of calculation, making it impossible to predict the number to which the answer should be rounded.

[standard_deviation.html?seed=186&problem=population](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/standard_deviation.html?seed=186&problem=population&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/standard_deviation.html?seed=186&problem=population&debug&activity=%5B%5B%22incorrect-activity%22%2C%22%5B%5C%228.8%5C%22%2C%5C%224.4%5C%22%5D%22%2C93%5D%2C%5B%22hint-activity%22%2C%220%22%2C1%5D%2C%5B%22hint-activity%22%2C%220%22%2C1%5D%2C%5B%22hint-activity%22%2C%220%22%2C1%5D%2C%5B%22hint-activity%22%2C%220%22%2C1%5D%2C%5B%22hint-activity%22%2C%220%22%2C2%5D%2C%5B%22hint-activity%22%2C%220%22%2C2%5D%2C%5B%22hint-activity%22%2C%220%22%2C2%5D%2C%5B%22hint-activity%22%2C%220%22%2C2%5D%2C%5B%22hint-activity%22%2C%220%22%2C2%5D%2C%5B%22hint-activity%22%2C%220%22%2C2%5D%5D)

[["8.8","4.4"]]

Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:9.0.1) Gecko/20100101 Firefox/9.0.1

MathJax is loaded, ready, queue length: 0