Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

**ladyrain95****Member**- Registered: 2013-05-01
- Posts: 1

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 (2013-05-01 10:11:28)*

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 92,978

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 agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

Offline

**stapel****Member**- Registered: 2006-07-22
- Posts: 15

ladyrain95 wrote:

I thought I understood the basics of this, but...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?

In order to help you figure out what you're doing wrong, you'll need to tell us what you're doing. Please reply with your steps and reasoning. Thank you!

Offline