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Statistics & Probability Formulas
Mean, median, mode, and chance. · 7 formulas
Mean
x̄ = Σx / nSum of values ÷ number of values
Example
5
Median
Middle value (sorted)Order the list, pick the middle
Example
3
Mode
Most frequent valueThe number that appears most often
Example
4
Range
Range = Max − MinSpread of the data
Example
28
Probability
P = favorable / totalChance of an event
Example
1/2
Complement Rule
P(not A) = 1 − P(A)Probability that A does not happen
Example
0.7
Weighted Mean
x̄ = Σ(w × x) / ΣwAverage that respects different weights
Example
≈ 83.33