# HP 12C Platinum User Manual Page 281

Financial calculator.

Ö Computes mean
(average) of x-values and
y-values using
accumulated statistics
(page 94).
 Computes weighted
average of y-(item) and
x-(weight) values using
accumulated statistics
(page 99).
v Computes sample
standard deviations of x-
and y-values using
accumulated statistics
(page 96).
R Linear estimate
(X-register), correlation
coefficient (Y-register).
Fits a line to a set of (x,y)
data pairs entered using
_, then extrapolates this
line to estimate a y-value
for a given x-value. Also
computes strength of
linear relationship (r)
among that set of (x, y)
data pairs (page 97).
Q Linear estimate
(X-register), correlation
coefficient (Y-register).
Fits a line to a set of (x,
y) data pairs entered
using _, then
extra-polates this line to
estimate an x-value for a
given y-value. Also
computes strength of
linear relationship (r)
among that set of (x,y)
data pairs (page 97).
Modes
] sets calculator to
RPN mode (page 19).
[ sets calculator to
algebraic (ALG) mode
(page 19).
Mathematics
r Computes square root
of number in displayed
X-register (page 100).
q Raises number in
Y-register to power of
number in X-register
(page 102).
y Computes reciprocal
of number in displayed
X-register (page 100).
e Computes factorial
[n•(n–1)... 3•2•1] of
number in displayed
X-register (page 100).
> Natural antilogarithm.
Raises e (approximately
2.718281828) to power
of number in displayed
X-register (page 100).
¿ Computes natural
logarithm (base e) of
number in displayed
X-register (page 100).
¡ Computes square of
the number displayed in
the X-register
(page 100).
Function Key Index
Number Alteration
B Rounds mantissa of
10-digit number in
X-register to match the
display (page 100).
Ñ Leaves only the
integer portion of
number in displayed
X-register by truncating
fractional portion
(page 101).
T Leaves only the
fractional portion of
number in displayed
X-register by truncating
integer portion
(page 101).
Stack Rearrangement
Ø Ù Opens and
closes parenthesis in
ALG mode.
(page 244)
~ Exchanges contents
of X and Y-registers of
stack (pages 90 and
234).
d RolIs down contents
of stack for viewing in
displayed X-register
(page 235).
F Recalls number
displayed before the
previous operation back
into the displayed
X-register (pages 90
and 238).
281