Statistics

Probability & Statistics Cheat Sheet

Complete probability and statistics cheat sheet with mean, variance, standard deviation, combinations, permutations, and distributions. Free PDF download.

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Basic Probability

NameFormulaNotes
Probability
0 ≤ P(A) ≤ 1
Complement
Union
Conditional
Bayes' Theorem

Counting

NameFormulaNotes
Permutation
Order matters
Combination
Order doesn't matter
Factorial
0! = 1
Binomial Coefficient
Symmetry property

Descriptive Statistics

NameFormulaNotes
Mean
Average
Variance
Standard Deviation
Sample Variance
n-1 for sample
Z-Score
Standardized score

Distributions

NameFormulaNotes
Binomial
Binomial Mean
Binomial Variance
Normal PDF
Poisson

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