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January 27, 2015

January 27, 2015

Posted by **Diane** on Tuesday, March 6, 2012 at 1:29pm.

- statistics -
**MathGuru**, Tuesday, March 6, 2012 at 6:48pmUse z-scores:

z = (x - mean)/(sd/√n)

x = 18

mean = 23

sd = 8

n = 64

Calculate z, then use a z-table to determine probability.

I hope this will help get you started.

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