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': 'In the birth weight of each of the 10 babies born in a hospital in a day is found to be 2.8 kgs, 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: Standard deviation measures the\xa0variation (dispersion) of an individual data from the mean.\nSD\xa0tells how tightly all the values are clustered around the mean in a set of data.\nHigh standard deviation indicates that the data is dispersed away from the mean.\nLow standard deviation indicates that the data points tend to be very close to mean, i.e. data points are clustered close to the mean.\nFor example, the average height for adult men in USA is about 70 inches, and standard deviation is 3 inches. Then -\n\n\nIf dispersion of mean is 1 SD → most men (about 68%) have a height within 3 inches of the mean (67-73) inches.\nIf dispersion of mean is 2 SD → almost all men (95%) have a height within 6 inches of the mean (64 - 76) inches.\nIf dispersion is zero SD all men would be exactly 70 inches.\n\n\nThat means greater the standard deviation greater will be the data spread away from standard deviation.\n\nComing back to question\n\nHere all newborn babies has 2.8 kgs of weight.\nThat means there is no dispersion from mean.\nSo, standard deviation is zero.', 'role': 'assistant'}]