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Formulas -> Probability and Statistics -> Statistics
Measures of Central Tendency
Arithmetic Mean
A
=
x
1
+
x
2
+
x
3
+
·
·
·
+
x
n
n
=
∑
x
i
i
=
1
n
n
∀
x
i
∈
ℝ
Geometric Mean
G
=
x
1
·
x
2
·
x
3
·
·
·
·
·
x
n
n
=
∏
i
=
1
n
x
i
n
∀
x
i
≥
0
Harmonic Mean
H
=
n
1
x
1
+
1
x
2
+
1
x
3
+
·
·
·
+
1
x
n
=
n
∑
i
=
1
n
1
x
n
∀
x
i
>
0
Quadratic Mean
Q
=
x
1
2
+
x
2
2
+
x
3
2
+
·
·
·
+
x
n
2
n
∀
x
i
≥
0