Khan/khan-exercises — Issue #9402: Creating box and whisker plots - Top quartile off by 1 place
Author: KhanBugz
Created: 2011-12-23 19:27:39+00:00
State: open
Labels: firefox, wrong-or-unclear

The bottom quartile is calculated as follows:

List the bottom half, excluding the median and the lowest number
4,5,5,6,6,6
Take the midpoint of the two values in the middle
5,6 = 5.5

The top quartile should be the same:
7,7,7,9,10,10
7,9 = 8
Instead, the clues and correct answer use 9,10 as the middle two.

[creating_box_and_whisker_plots.html?seed=129&problem=0](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/creating_box_and_whisker_plots.html?seed=129&problem=0&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/creating_box_and_whisker_plots.html?seed=129&problem=0&debug&activity=%5B%5B%22incorrect-activity%22%2C%22%5B4%2C5%2C6%2C9%2C10%5D%22%2C93%5D%2C%5B%22hint-activity%22%2C%220%22%2C22%5D%2C%5B%22hint-activity%22%2C%220%22%2C23%5D%2C%5B%22hint-activity%22%2C%220%22%2C27%5D%2C%5B%22hint-activity%22%2C%220%22%2C29%5D%2C%5B%22hint-activity%22%2C%220%22%2C30%5D%2C%5B%22incorrect-activity%22%2C%22%5B4%2C5.5%2C6%2C8%2C10%5D%22%2C97%5D%2C%5B%22hint-activity%22%2C%220%22%2C8%5D%2C%5B%22correct-activity%22%2C%22%5B4%2C5.5%2C6%2C9.5%2C10%5D%22%2C400%5D%5D)

[[4,5,6,9,10],[4,5.5,6,8,10],[4,5.5,6,9.5,10]]

Mozilla/5.0 (Ubuntu; X11; Linux i686; rv:9.0.1) Gecko/20100101 Firefox/9.0.1

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