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: Dental
[{'content': 'In a class, the mean weight of 4 students is 90 kg and standard deviation is 30, then 95% confidence interval would be accordingly: \nSelect and explain. \nA. 60-80, B. 30-150, C. 60-120, D. 70-110', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Here, Mean = 90 ; Standard deviation = 30\n95% confidence interval = Mean +/- 2 S.D\nHence, 90+ (2x30) = 90+60 = 150\n\xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa090- (2x30) = 90-60 = 30', 'role': 'assistant'}]