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': "Pearson's measure of skewness - \nSelect and explain. \nA. Mode - Mean/SD, B. Mean - Mode/SD, C. SD/Mode - mean, D. Mean - Mode/SD", 'role': 'user'}, {'content': "Answer: B \nExplanation: Step 1: Subtract the\xa0median\xa0from the\xa0mean: 70.5 – 80 = -9.5.\nStep 2: Divide by the standard deviation: -28.5 / 19.33 = -1.47. Caution: Pearson's first coefficient of skewness uses the\xa0mode. \nTherefore, if the\xa0mode\xa0is made up of too few pieces of data it won't be a stable measure of central tendency.", 'role': 'assistant'}]