This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
[{'content': 'Standard detion is defined as: March 2009, March 2013 (a, c, f h) \nSelect and explain. \nA. Value of middle observation when data is arranged in ascending order., B. Arithmetic mean, C. Dispersion of values about the mean, D. Most frequently occurring value', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C: Dispersion of values about the mean The steps are: Compute the mean for the data set. Compute the detion by subtracting the mean from each value. Square each individual detion. Add up the squared detions. Divide by one less than the sample size. Take the square root. Standard detion gives us an idea of the spread of the dispersion; that the larger the standard detion, the greater the dispersion of values about the mean.', 'role': 'assistant'}]