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': 'If the birth weight of each of the 10 babies born in a hospital in a day is found to be 2.8kg, then the standard deviation of this sample will be: \nSelect and explain. \nA. 2.8, B. 0, C. 1, D. 0.28', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In the given question, the birth weight of each of the 10 babies born in a hospital in a day is Count, to ht 28 kg, thus = ZERO\nSo the standard deviation of this sample will be,', 'role': 'assistant'}]