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n!
(nҀr)!
n!
n!(nҀr)!
Permutation
•Input range: n ͧ r ͧ 0 (n, r : integers)
•Formula: nPr ҃
Combination
•Input range: n ͧ r ͧ 0 (n, r : integers)
•Formula: nCr ҃
Population Standard Deviation
n
҃
n
⌺
i ҃ 1
n
(xi – x)
2
҃
n
⌺
x
2
– (⌺x)
2
/ n
Sample Standard Deviation
n – 1
҃
n – 1
⌺
i ҃ 1
n
(xi – x)
2
҃
⌺
x
2
– (⌺x)
2
/ n
n – 1
Arithmetic Mean
o
҃
n
⌺
i ҃ 1
n
xi
҃
⌺
x
n