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osuguy · 2008 October 6th, 06:43 PM

percentage less than mean+1sigma = 68 + [(100-68)/2] = 84%
84% of 500 = 420

2008 October 6th, 06:43 PM	#7 (permalink)
osuguy Eager! Join Date: Sep 2007 Posts: 36	percentage less than mean+1sigma = 68 + [(100-68)/2] = 84% 84% of 500 = 420