You have written a function called $Z-$score that calculates the number of standard deviations away from the mean a given value is$.$ That is what a $Z$ score is$.$ A $Z-$score is calculated as a value minus

its mean $($the average$)$ divided by the standard deviation. Here is an example $(x$ refers to the value$)$:

$x=10,$ mean $=5,$ gtdev $=2\mathrm{.}5$

$z-$score $=\frac{10-5}{2\mathrm{.}5}=2$

This means $x$ was two standard deviations above the mean. The function you have takes as inputs $x,$ mean, and stdev. It looks like this:

def $,$ mean, stdev$)$:

return mean