Khan/khan-exercises — pull request #17795 by smenks13 (2012-03-28 16:03:24+00:00)
Title: New exercise: Z-scores 3

Finding areas under the curve with a z-table.

Sandcastle: http://sandcastle.khanacademy.org/media/castles/smenks13:zScore3/exercises/z_scores_3.html