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
The values of systolic BP in a given data are 120, 120, 130, 120, 110, 110, 200. Which of the following will be best to used for central tendency in the given data? 
Select and explain. 
A. Mean, B. Median, C. Mode, D. Harmonic mean
B: Median
Answer: B: Median 
Explanation: Ans. is 'b' i.e., Median Arithmetic meanIt is the most commonly used statistical average.To calculate mean, add up the values of all individual observation and then divide by the number of observations.The process of adding together is called summation and is denoted by the sign E or S.