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
[{'content': 'Standard detion is the measure of: \nSelect and explain. \nA. Chance, B. Central tendency, C. Detion from mean value, D. None', 'role': 'user'}, {'content': "Answer: C \nExplanation: 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: =", 'role': 'assistant'}]