Question 1194418
<font color=black size=3>
I'll do part A to get you started.


The z score formula is
z = (x - mu)/sigma
where,
x = raw score
mu = mean
sigma = standard deviation


In this case,
mu = 105
sigma = 20
This applies to parts A through C


For part A, we plug in those values mentioned and x = 88 to find...
z = (x - mu)/sigma
z = (88 - 105)/20
z = -17/20
<font color=red>z = -0.85</font> is the answer to part A.


A z score of -0.85 means we're exactly 0.85 standard deviations below the mean.


I'll let you try parts B and C on your own. 
Let me know if you still have questions, or if you need me to check your answers. 
</font>