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February 28, 2015

February 28, 2015

Posted by **joyce** on Monday, November 18, 2013 at 9:18pm.

- statistics -
**Kuai**, Monday, November 18, 2013 at 10:55pmmean = 1008/15 = 67.2

sd =sqrt(140.4/14) = 3.167

z = (x1 - 67.2)/3.167

x1 = 1*3.167 + 67.2 = 70.37

z = (x2 - 67.2)/3.167

-1 = (x2 - 67.2)/3.167

x2 = -1*3.167 + 67.2 = 64.033

The ages are 60 and 70 respectively.

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