Casio fx-260 User Manual page 33

Permutation
• Input range: n
• Formula: nPr
Combination
• Input range: n
• Formula: nCr
Population Standard Deviation
n
Sample Standard Deviation
n –
1
Arithmetic Mean
n
o
i
r
n!
(n r)!
r
n!
n!(n r)!
n
2
(xi – x)
i 1
n
n
(xi – x)
1
i
n – 1
xi
x
1
n n
0 (n, r : integers)
0 (n, r : integers)
2 – ( x)
x
n
2
2
– ( x)
x
n – 1
— 31 —
2 /
n
2
/
n