This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Normal Distribution, Skewed Distributions, Subject name: Social & Preventive Medicine
Pearson's Skewness Coefficient is given BY 
Select and explain. 
A. Mean-Mode /SD, B. Mode-Mean/SD, C. SD/Mean-Median, D. SD/Median-Mean
A: Mean-Mode /SD
Answer: A: Mean-Mode /SD 
Explanation: SKEWNESS: * Is measure of asymmetry of a probability distribution of a random variable * Measures of skewness: - - Pearson's mode or First Skewness coefficient = (Mean - Mode) /SD - - Pearson's median or second Skewness coefficient = 3 (Mean - Median) /SD - - Quaile skewness = ( Q3-2Q2 + Q1)/Q3 - Q1