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technically for z score 99.7% = 3 but in this case its using 3 for 99% instead of 2.58
So 230+480 / 2 = 355 = mean
355 +- 3(X) = 480
480 - 355 = 125
125/3 = 41667
Edited 1 time(s). Last edit at Tuesday, June 2, 2009 at 12:33PM by chung.da.neu. |
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发表于 2011-7-11 18:38
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