Grouped Frequency Distributions and Histograms
Class Width = largest-smallest / number of groups wanted
Advantages = patterns are revealed leading to a conclusion
Disadvantages = Some detail is lost
Quantiles Q1 = n/4 if this in a non-integer, use the next number, if it is an integer the value is between that one and the next.
Q2 = n/2
Q3 = n x 3/4