Question 184791
An aptitude test has a mean of 220 and standard deviation of 10. find the corresponding z score for: a) a test score of 232 b) a test score of 212 
Help please?????

<pre><font size = 4 color = "indigo"><b>
The formula for a z-score for a test score of x
with mean {{{mu}}} and standard deviation {{{sigma}}}
is  

{{{z=(x-mu)/sigma}}}

So for
</pre></font></b>
a) a test score of 232
<pre><font size = 4 color = "indigo"><b>
{{{z=(x-mu)/sigma}}}

{{{z=(232-220)/10}}}

{{{z=(12)/10}}}

{{{z=1.2}}}

and for
</pre></font></b>
b) a test score of 212
<pre><font size = 4 color = "indigo"><b>
{{{z=(x-mu)/sigma}}}

{{{z=(212-220)/10}}}

{{{z=(-8)/10}}}

{{{z=-.8}}}

Edwin</pre>