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
Which one of the following is not a measure of dispersion - 
Select and explain. 
A. Mean, B. Range, C. Mean detion, D. Standard detion
A: Mean
Answer: A: Mean 
Explanation: The measures of dispersion are; - the range - the mean detion - the standard detion Reference : Park's textbook of preventive and social medicine, 23rd edition, pg no:848