Boxplot

Summary
IQR = middle 50%

Median

Fences
Lower fence = Q1 - 1.5(IQR)

Upper fence = Q3+ 1.5(IQR)

Standard Deviation
Mean = ӯ = (Σy) / n

Variance = (y - ӯ)2/ (n-1)

Standard deviation = s = √(variance)

Z-score
z = (y - ӯ) / s

(y - ӯ) shifts data: adding/subtracting to all data increases/decreases the median and mean (does not change standard deviation, range, or IQR)

s rescales data: multiplying/dividing to all data increases/decreases median, mean, standard deviation, range, and IQR by the same multiple

Evolution
No evolutions