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September 18, 2014

September 18, 2014

Posted by **CM** on Monday, September 28, 2009 at 3:49pm.

I think I use mean (500) + z-score * SD (100), but I do not know how to get the z-score?

- stats -
**economyst**, Monday, September 28, 2009 at 10:06pmYou dont need a z-score for this problem. A normal distribution means that half the observations are above the mean, half below. The answer is 50%

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