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## #1 2013-05-02 08:02:56

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### Z-Scores

I am at college level "Math For Liberal Arts".. we are in our last chapter and it's Statistics:

Find the z-score that best satisfies the condition.

14% of the total area is to the left of z.

I thought I understood the basics of this, but I'm frustrated and really confused. Anytime I have to find a number from the "Areas Under the Standard Normal Curve" chart I get the wrong number. I don't know what I'm doing wrong.. can someone please help me?

Last edited by ladyrain95 (2013-05-02 08:11:28)

## #2 2013-05-02 08:48:32

bobbym

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### Re: Z-Scores

Hi;

http://easycalculation.com/statistics/p … -score.php

Enter in 14 and left tailed and out pops -1.08.

Or use the table here.

http://math2.org/math/stat/distributions/z-dist.htm

It is for below ( to the left ) of a z score. Look for .14. You will find it in row (-1) and column (.08). Answer again is -1.08 standard deviations.

A quick math check:

In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

stapel
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