Statistics — Mean, Median, Spread, and Probability
Statistics summarizes data and measures uncertainty. Common tools include the mean, median, standard deviation, and probability.
Statistics turns lists of numbers into summaries. Choose the measure that matches the question: center, spread, position, or chance.
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Example problems
Calculators
- Statistics Calculator
- Mean Calculator
- Median Calculator
- Standard Deviation Calculator
- Probability Calculator
- Z-Score Calculator
Guides
Formulas
Frequently asked questions
Is standard deviation population or sample?
Population standard deviation divides by n. Sample standard deviation divides by n − 1. Use the version your assignment specifies.