統計學1：基本知識——均值、方差、標準差

- 整體(Population) 抽樣(Sample) 均值(mean) μ = ∑ i = 1 N x i N \mu = \frac{\sum_{i=1}^{N}{x_i}}{N} μ=N∑i=1N​xi​​ x ‾ = ∑ i = 1 n x i n \overline{x}=\frac{\sum_{i=1}^{n}{x_i}}{n} x=n∑i=1n​xi​​ 方差(variance) σ

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