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
Simplest measure of dispersion-a)  Rangeb) Standard deviationc) Mean deviationd) Co-efficeint of range 
Select and explain. 
A. a, B. ad, C. ac, D. ab
A: a
Answer: A: a 
Explanation: The range
o Range is the simplest measure of dispersion.
o It is defined as the difference between the largest and smallest values of the variable.
   Range (R) = Largest value (L) - Smallest value (S)