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January 31, 2015

January 31, 2015

Posted by **Kyle** on Sunday, April 7, 2013 at 10:17am.

- AP Stats (math) -
**Reiny**, Sunday, April 7, 2013 at 11:04amz-score = (25-20.5)/15.4

then look up that z in your tables,

subtract that from 1

that is,

1 - value you looked up

or

you can use one of my favourite websites

http://davidmlane.com/normal.html

Make sure "area from value " is clicked on

enter the mean, the sd, and click on "below" and enter 25

The value of .6149 should agree with the value you found above

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