This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Biostatistics, Subject name: Social & Preventive Medicine
Not a measure of central tendency- 
Select and explain. 
A. Mean, B. SD, C. Mode, D. Median
B: SD
Answer: B: SD 
Explanation: Ans. is 'b' i.e., SD * The commonly used statistical average (measures of central tendency) are (i) Arithmetic mean, (ii) Median and (iii) Mode.