HP 49G User Manual page 252

PCOV
x
kn
n
n
2
Σ
1-252
Σ
1
x
n
2
1
Level 1/Argument 1
n
1
∑
( ) x (
-- -
x – x – x
kn n kn
n
1 1 2
k = 1
n x
1 kn
x
n
n
1
→
Σ
Σ
)
n
2
2
2
Level 1/Item 1
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Command Reference: Part C, G-P (1.1)