Khan/khan-exercises — Issue #14069: Variance - 31/4=7.8?
Author: KhanBugz
Created: 2012-02-17 15:06:03+00:00
State: open
Labels: firefox, wrong-or-unclear, xp

Reporter: irnik12345@gmail.com

The Hint is saying that (18+2+7+4)/4=7.8 I calculated it that: (18+2+7+4)/4=(20+11)/4=31/4 = 7.75, I suggested that I didn't round, so that's the error (to round to the tenth), but the next number that has to be calculated is to the hundredths. I suggest there is an error with the answer, if not - please tell me where I wrong

[variance.html?seed=175&problem=population](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/variance.html?seed=175&problem=population&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/variance.html?seed=175&problem=population&debug&activity=%5B%5B%22incorrect-activity%22%2C%22%5B%5C%227.75%5C%22%2C%5C%2250.9%5C%22%5D%22%2C83%5D%2C%5B%22incorrect-activity%22%2C%22%5B%5C%227.75%5C%22%2C%5C%2250.92%5C%22%5D%22%2C5%5D%2C%5B%22hint-activity%22%2C%220%22%2C6%5D%2C%5B%22hint-activity%22%2C%220%22%2C7%5D%2C%5B%22hint-activity%22%2C%220%22%2C8%5D%2C%5B%22hint-activity%22%2C%220%22%2C11%5D%2C%5B%22hint-activity%22%2C%220%22%2C12%5D%2C%5B%22hint-activity%22%2C%220%22%2C13%5D%2C%5B%22hint-activity%22%2C%220%22%2C13%5D%2C%5B%22hint-activity%22%2C%220%22%2C14%5D%5D)

[["7.75","50.9"],["7.75","50.92"]]

Mozilla/5.0 (Windows NT 5.1; rv:10.0.1) Gecko/20100101 Firefox/10.0.1

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