# Math Help - Homework Help Please!!!! (Statistics)

1. ## Homework Help Please!!!! (Statistics)

Jim, a talented professor, administers an achievement test to a group of his students. The mean of the distribution of the scores is 40 and the standard deviation is 8. In this distribution, a raw score of 56 would be equivalent to a z-score of:[/B]

A. +1.0
B. +2.0
C. +8.0
D. +16.0

2. Well...

$z = \frac{x-\mu}{\sigma}$

$z= \frac{56-40}{8} = +2$

So, $(b)$

But, more importantly do you know what a $z-score$ is? And why this remarkable fact holds?