Question

PLEASE HELP!! what is the z-score for a raw score of 21?

Answer 1

You need the standard deviation and the mean of the sample or populaation to get the z-score of a raw score.

Answer 2

what is your mean and standard deviation

\[z =\frac{x - mu}{\sigma}\]

Answer 3

My standard deviation is 12.39033527 and my mean is 35.1

Answer 4

\[z = \frac{21 - 35.1}{12.39033527}\]

I'll leave you to calculate it. As a guide... z will be about -1. 1

Answer 5

thanks so much