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MissPhiladelphia
The Standard Deviation is a measure of how spread out numbers are. Standard deviation can be calculated by the expression as follows:

s = √∑(x - x(mean))^2/n-1

x(mean) = 210 / 7 = 30

s = √∑(x - 30)^2 / 7-1
s = 14.53 <------ OPTION C

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