4.1 Types of Scales4.1.1 Nominal Scale4.1.2 Ordinal Scale4.1.3 Interval Scale4.1.4 Ratio Scale4.2 Measures of Central Tendency4.2.1 Mean, Median and Mode4.2.2 Geometric and Harmonic Mean4.3 Skewness4.3.1 Measuring Skewness4.3.2 Relationship of Mean and Median4.3.3 Kurtosis4.4 Measure of Variation4.4.1 Range4.4.2 Absolute Deviation4.4.3 Standard Deviation4.4.4 Average Deviation4.4.5 Quartile Deviation4.4.6 Coefficient Deviation4.5 Probability Distribution4.5.1 Binomial Distribution4.5.2 Poisson Distribution4.5.3 Uniform Distribution4.5.4 Exponential Distribution4.5.5 Normal DistributionExercises