Last updated 5 years ago
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The average of the squared differences from the Mean.
It shows numerically how far the data points are from the mean. Neither the mean nor the median can describe this. Variance, σ2=1n∑i=1n(xi−μ)2\sigma^{2}=\frac{1}{n}\sum_{i=1}^n(x_{i}-\mu)^2σ2=n1∑i=1n(xi−μ)2
