Question 197124
Recall, the z score can be found by the formula 


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



where *[Tex \LARGE \mu] is the mean and *[Tex \LARGE \sigma] is the standard deviation.



So all you have to do is plug in the corresponding values to get:



*[Tex \LARGE 3=\frac{32-20}{\sigma}]



and solve for *[Tex \LARGE \sigma] to get the standard deviation.