1. Central Tendency
   1. Mean
   2. Median
   3. Mode
   4. Trimean
   5. Trimmed Mean
   6. Summary 
2. Spread
   1. Range
   2. Semi-Interquartile Range
   3. Variance
   4. Standard Deviation
   5. Summary 
3. Shape
   1. Skew
   2. Kurtosis 
4. Graphs
   1. Frequency Polygons
   2. Histograms
   3. Stem and Leaf Displays
   4. Box Plots
5. Exercises