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Statistics
Probability & Statistics Cheat Sheet
Complete probability and statistics cheat sheet with mean, variance, standard deviation, combinations, permutations, and distributions. Free PDF download.
Basic Probability
| Name | Formula | Notes |
|---|---|---|
| Probability | 0 ≤ P(A) ≤ 1 | |
| Complement | ||
| Union | ||
| Conditional | ||
| Bayes' Theorem |
Counting
| Name | Formula | Notes |
|---|---|---|
| Permutation | Order matters | |
| Combination | Order doesn't matter | |
| Factorial | 0! = 1 | |
| Binomial Coefficient | Symmetry property |
Descriptive Statistics
| Name | Formula | Notes |
|---|---|---|
| Mean | Average | |
| Variance | ||
| Standard Deviation | ||
| Sample Variance | n-1 for sample | |
| Z-Score | Standardized score |
Distributions
| Name | Formula | Notes |
|---|---|---|
| Binomial | ||
| Binomial Mean | ||
| Binomial Variance | ||
| Normal PDF | ||
| Poisson |
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