Variance measures the average squared deviation of values from their mean.
What Is Variance?
Variance measures the average squared deviation of values from their mean.
Examples of Variance
1
Data with values far from the mean have larger variance.Formula and Key Points
Formula / rule
σ²=Σ(x−μ)²/N
- Know the definition and standard notation for Variance.
- Be able to recognise or compute variance in a small example.
- Connect the concept to nearby topics in the same subject before using it in larger CSE problems.
Why This Matters in Computer Science
Used in data analysis, machine-learning evaluation, experiments, monitoring and performance measurement.
Related Math Terms
Variance: Frequently Asked Questions
What is Variance?
Variance measures the average squared deviation of values from their mean.
Why is Variance useful in computer science?
Used in data analysis, machine-learning evaluation, experiments, monitoring and performance measurement.