Posted by **Jesse** on Sunday, May 13, 2012 at 7:53pm.

Having problems reading the z-table. I don't understand how .1500% equates to a 1.04 z-score

Thank you for your help

- Statistics -
**MathMate**, Sunday, May 13, 2012 at 10:11pm
The .15% is the tail end of the probability distribution.

Probability distributions are such that the total area is 1.0 from Z=-∞ to Z=+∞.

For the normal distribution, Z=0 is at 0.5, which means that the probability of a variable falling above 0 is exactly that of falling below 0.

Here you're looking for the value of Z for which the probability of a variable falling above Z is 0.15, and below is 0.85. So look up the table (below) for Z such that the entries of the table is 0.85, which corresponds to a Z=1.04.

Also, check the little sketch in the following table:

http://www.math.unb.ca/~knight/utility/NormTble.htm

## Answer This Question

## Related Questions

- statistics - Reading placement scores for a particular college are normally ...
- Statistics - A study of reading ability in schoolchildren chose 60 fifth-grade ...
- Statistics - A sample of n=20 has a mean of M = 40. If the standard deviation is...
- statistics - Average is 8500 with a standard deviation. Of 1500 with a z score ...
- reading - she is having problem with comprehension and I do help her a lot but ...
- Statistics - 4. The Graduate Record Exam (GRE) has a combined verbal and ...
- Statistics - 4. The Graduate Record Exam (GRE) has a combined verbal and ...
- statistics - 4. The Graduate Record Exam (GRE) has a combined verbal and ...
- Statistics - 1. Consider a population with µ=73.6 and 0 = 5.38 (A) Calculate the...
- Statistics - Consider a population with µ=73.6 and 0 = 5.38 (A) Calculate the z-...

More Related Questions