Frequency Density :
Adding the frequency up as you go along.
Quartiles and Ranges
Upper Quartile : 3/4 of the way
Median : Half
Lower Quartile : 1/4 of the Way
Interquartile range : The Range from upper to lower
Range: The Range from Highest to Lowest.
Scatter Graph Correlations:
Positive Correlations: bottom left to top right
Negative correlations: top left to bottom right
No Correlations: No linear available.No correlation is here
The range is Upper Extreme minus Lower and interquartile is Upper minus lower quartile.