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': 'A researcher draws unbiased sample of 100 adult delhites and find that their mean weight is 72 kg with a standard detion of 1.5. 95% of wt of delhites shall be between: \nSelect and explain. \nA. 66 and 78 kg, B. 69 and 75 kg, C. 70.5 and 73.5 kg, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In the given question, n = 100 adult Delhites, mean weight (u) = 72kg, standard detion (SD) = 1.5 95% wt of delhites = Mean +- 2SD (u +- 2SD) = 72 +- 2 (1.5) = 72 +- 3 =b/w 69 & 75 kg wt', 'role': 'assistant'}]