Stem and leaf diagrams --> discrete/continuous data
mean = Σx grouped data - Σfx
n Σf
mid range = 1/2(min value + max value)
Sxx = Σx²- nx͞² grouped data - Σfx²- nx͞²
Mean Squared Deviation = Sxx Root mean squared deviation = Sxx
n n
The Varience = Sxx The standard deviation = Sxx
n-1 n-1
Outlier: mean ± 2 S.D
Linear coding: Used for very large data --> mean × ÷ + - S.D × ÷
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