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 measure of dispersion- 
Select and explain. 
A. Range, B. Mean detion, C. Median, D. Standard detion
C: Median
Answer: C: Median 
Explanation: Ref:Parks 23rd edition pg 848 Measures of dispersion: Range: simplest measure . Mean or average detion. Standard detion : most frequently used .