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HP HP-11C User Manual

HP HP-11C
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60
Mean
Section
3:
Numeric
Functions
The
function
computes
the
artithmetic
mean
(average)
of
the
x
and
y
statistics
accumulated
in
registers
R;
and
R,
respectively.
When
you
press
[9][3]):
The
contents
of
the
stack
registers
lift
in
the
same
way
as
when
you
press
[RCL][
2
+],
as
described
on
page
57.
The
mean
of
the
x
values
(x)
is
calculated
using
the
statistics
accumulated
in
R;(2x)
and
Ry(n).
The
mean
of
the
y
values
(¥)
is
calculated
using
the
data
accumulated
in
registers
R3(Zy)
and
Ry(n).
The
formulas
used
are
shown
below.
X
-
Sy
y=—
n n
x
=
The
values
for
X
and
y
are
placed
in
the X-
and
Y-registers
of
the
stack.
T+
S
&=
ya
X=>
Example.
From
the
five
year
statistical
data
you
accumulated
(and
corrected)
in
the
previous
example,
calculate
the
average
coal
production
and
electrical
output
for
the
entire
period.
Keystrokes
Display
6.1352
Average
electrical
output
(average
of
X-register
inputs)
for
the
five-year
period.
xZy
1.8316
Average
coal
production
(average
Y-register
inputs)
for
the
five-year
period.

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HP HP-11C Specifications

General IconGeneral
BrandHP
ModelHP-11C
CategoryCalculator
LanguageEnglish

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