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
All are measures of dispersion around central value except 
Select and explain. 
A. Mode, B. Variance, C. Standard detion, D. Mean
B: Variance
Answer: B: Variance 
Explanation: The several measures of variation or dispersion of which the following are widely known Range The mean or Average detion The standard detion Ref : Park&;s Textbook of Preventive and Social Medicine; 23rd edition - Pgno. 848