This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central tendency, Dispersion, Subject name: Social & Preventive Medicine
Mean weight of 100 children was 12 kg. The standard detion was 3. Calculate the percent Coefficient of variation: 
Select and explain. 
A. 25%, B. 35%, C. 45%, D. 55%
A: 25%
Answer: A: 25% 
Explanation: Coefficient of variation: - Is a measure used to compare relative variability - Is a unit-free measure to compare dispersion of one variable with another - Is SD expressed as percentage of mean CV = In the given question, Mean weight (u) = 12 kg, n = 100, Standard detion (s) = 3 Thus, coefficient of variance =s/ux 100 = 3/12 x100 = 25%