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December 20, 2014

December 20, 2014

Posted by **Jane** on Sunday, February 10, 2013 at 4:32pm.

- Statistics -
**MathGuru**, Sunday, February 10, 2013 at 5:35pmUse z-scores:

z = (275 - 273)/(20/√64) = ?

Once you calculate the z-score, check a z-table from mean to that z for your probability.

- Statistics -
**Jane**, Sunday, February 10, 2013 at 6:36pm2/2.5 = 0.8 z=0.7881 1-0.7881 = 0.2119

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