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Answer:
Step-by-step explanation:
First find the airithmatic mean
(-3-5+8+11+13)/5= 4.8
[tex]\frac{(-3-4.8)^2+(-5-4.8)^2+(8-4.8)^2+(11-4.8)^2+(13-4.8)^2}{5}= 54.56[/tex]