All Topics
Statistics & Data Analysis
Standard Deviation
标准差
Low frequency
Exam Frequency
0.5
avg per test
0
Quantitative Reasoning
0.5
Math Achievement
What to Study
- Understanding spread
- Interpreting standard deviation
- Comparing data sets by spread
Key Formulas
σ = √(Σ(xᵢ - x̄)² / N) for population
Conceptual: larger σ = more spread out data