This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Normal Distribution, Skewed Distributions, Subject name: Social & Preventive Medicine
Standard detion is the measure of: 
Select and explain. 
A. Chance, B. Central tendency, C. Detion from mean value, D. None
C: Detion from mean value
Answer: C: Detion from mean value 
Explanation: STANDARD DETION (SD) SD is the measure of Detion from mean value. SD is most common and generally most appropriate measure of dispersion SD is defined as the 'root-mean-square (RMS) detion of the values from their mean', or as the square root of the variance SD calculation: =