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bill12 · Jan 28, 2011, 07:34 PM

ebaines · Jan 31, 2011, 10:53 AM

Bill:

I find it hard to believe that this question belongs in "Early Childhood Education," but here goes:

To find the z-score you need to also know the mean and the standard deviation of the target population:

$<br /> z = \frac {x- \mu} {\sigma}\<br />$

where:
x = raw score to be standardized,
$\mu$ = mean of the population, and
$\sigma$ = the standard deviation of the population.

You've told us that x = 78, but not what either $\mu$ or $\sigma$ are.