Variance σ² (population form) and shortcut (Mean of squared deviations = mean of squares minus square of mean)
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Mean of squared deviations = mean of squares minus square of mean
What each symbol means
| Symbol | What it stands for |
|---|---|
| n | Number of observations |
| \sigma^2 | Variance |
When to use this
JEE often uses this population-style form for listed data.