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Statistics
4 formulas · Mathematics
Arithmetic mean
x
ˉ
=
1
n
∑
i
=
1
n
x
i
\bar{x}=\dfrac{1}{n}\sum_{i=1}^{n}x_i
x
ˉ
=
n
1
i
=
1
∑
n
x
i
Variance
σ
2
=
1
n
∑
i
=
1
n
(
x
i
−
x
ˉ
)
2
\sigma^2=\dfrac{1}{n}\sum_{i=1}^{n}(x_i-\bar{x})^2
σ
2
=
n
1
i
=
1
∑
n
(
x
i
−
x
ˉ
)
2
Standard deviation
σ
=
σ
2
\sigma=\sqrt{\sigma^2}
σ
=
σ
2
Median
middle value of the ordered data set
\text{middle value of the ordered data set}
middle value of the ordered data set
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