Wednesday

October 22, 2014

October 22, 2014

Posted by **Anonymous** on Wednesday, April 9, 2014 at 2:24am.

- math -
**Reiny**, Wednesday, April 9, 2014 at 7:07amz-score for the 169 = (169-180)/8 = -1.375

x-score for the 191 = (191-180)/8 = +1.375

look up value for 1.375 and the value for -1.375

subtract the two values

You should get .8309

I recommend this webpage for these type of questions.

http://www.wolframalpha.com/input/?i=plot+y+%3D+%28x%5E2%2B4x-5%29%2F%28x-2%29+%2C+y+%3D+x%2B6

The beauty of this page is that it lets you enter the mean and SD directly without even finding the z-score.

Personally, I don't see any difference in going to some table that "somebody" created ages ago, and using this page. In either case you are not actually doing the arithmetic.

notice you can just enter 180 for the mean, 8 for the sd, click on the "between" and enter 169 and 191 to get 0.8309

Bookmark this webpage for future use.

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