Question 662969
The z-score for any value x that lies in a set is given by {{{z = (x - mu)/sigma}}}, where {{{mu}}}is the mean {{{sigma}}}is  the standard deviation.

Here, the mean is {{{51}}} and the standard deviation of {{{5.0}}}. 


I. a test score of {{{64 }}} 


{{{z = (64 - 51)/5.0}}}


{{{z = 13/5.0}}}


{{{z = 2.6}}}


II. a test score of {{{47}}}


{{{z = (47 - 51)/5.0}}}


{{{z = -4/5.0}}}


{{{z = -0.8}}}