A score is 15 points below the mean results in a z - score of -.75;...
A score is 15 points below the mean results in a z - score of -.75; what is the standard deviation?
Group of answer choices
8
12
16
20
Homework Answers
Solution,
z-score = -0.75
x = -15 ( 15 points below the mean )
Using z-score formula,
x = z * 
-15 = -0.75 *
standard deviation =
correct option is = 20
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