This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Measures of Central Tendency and Distribution, Subject name: Social & Preventive Medicine
[{'content': 'Which statement is TRUE about Standard normal distribution curve : \nSelect and explain. \nA. Mean -1, standard deviation - zero, B. Standard deviation 1, mean-zero, C. Curve skews towards left, D. Curve skews towards right', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' ie Standard deviation = 1 & mean is 0 Standard Normal Curve*is based on infinitely large no of observationsit is smooth, bell shaped, perfectly symmetrical curve, it does not skew either to the right or left side.the total area of the curve is 1*Mean is O, *Standard deviation is 1*Mean, median, mode all coincide*", 'role': 'assistant'}]