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HP 25 User Manual
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Function
Keys
69
Press
Display
1
10.10
Standard
deviation.
If
the
10
persons
used
in
the
sample
were
actually
the
10
wealthiest
persons,
the
data
would
have
to
be
considered
as
a
population
rather
than
as
a
sample
.
The
relationship
between
sample
standard
deviation
(s)
and
the
population
standard
deviation
(s')
is
illustrated
by
the
following
equation:
~
s'
=sv~-n--
Since
11
is
automatically
accumulated
in
register
R
3
when
the
data
are
accumulated
by
the
m
key,
it
is
a
simple
matter
to
con-
vert
the
sample
standard
deviation,
which
has
already
been
calculated,
to
population
standard
deviation.
For
example,
if
the
accumulations
in
registers
R3
through
R7
are
still
intact
from
the
previous
example,
you
can
calculate
the
population
standard
deviation
this
way:
Press
Display
o
@]
10.10
Sample
standard
deviation
(s)
.
liD
3
10.00
Recalls
11.
1
EJ
9.00
Calculates
11-1
.
1i!D3@
1
0.90
Divides
11-1
by
11.
o
~
0
1
9
.
58
Population
standard
deviation
(s')
.
Deleting
and
Correcting
Data
If
you
key
in
an
incorrect
value
and
have
not
pressed
m
,
press
lD3
and
key
in
the
correct
value.
If
one
of
the
values
is
changed,
or
if
you
discover
after
you
ha
ve
pressed
the
m
key
that
one
of
the
values
is
in
error
,
you
can
correct
the
summations
by
using
the
l
E
l
key
as
follows:
1.
Key
the
incorrect
data
pair
into
the
X-
and
Y-
registers
.
2.
Press
0
IE
]
to
delete
the
incorrect
data.
3.
Key
in
the
correct
values
for
x
and
y.
(If
one
value
of
an
x,
y
data
pair
is
incorrect,
both
values
must
be
deleted
a
nd
reentered
.
)
4.
Press
m.
72
74
Table of Contents
Table of Contents
4
The HP-25 Programmable Scientific Calculator
9
Function Key Index
9
Memory
10
Programming Key Index
10
The HP-25 Means Painless Programming
13
Manual Problem Solving
13
Programmed Problem Solving
14
Section 1: Getting Started
17
Display
17
Keyboard
17
Keying in Numbers
18
Negative Numbers
18
Clearing
19
Functions
19
Chain Calculations
22
A Word about the HP-25
26
Section 2: Controlling the Display
29
Display Control Keys
29
Automatic Display Switching
34
Keying in Exponents of Ten
35
Calculator Overflow
37
Error Display
37
Section 3: the Automatic Memory Stack the Stack
39
Initial Display
39
Manipulating Stack Contents
39
The
39
Clearing the Stack MMM Key
42
One-Number Functions and the Stack
44
Two-Number Functions and the Stack
44
Chain Arithmetic
46
Order of Execution
49
Constant Arithmetic
50
Section 4: Function Keys
53
Last X
53
Prefix Clear
54
Number Alteration Keys
55
Reciprocals
56
Square Roots
56
Squaring
57
Using Pi
57
Percentages
58
Storage Registers
59
Trigonometric Functions
63
Polar/Rectangular Coordinate Conversion
66
Logarithmic and Exponential Functions
67
Statistical Functions
70
Vector Summations
74
Section 5: Programming
77
What Is a Program
77
Why Write Programs
77
Three Modes of Operation
78
Introductory Program
79
Running a Program
82
Gto 00
82
Writing a Second Program
83
Interrupting Program Execution
86
Branching
91
Editing a Program
95
Program Applications
101
Afterword
103
Appendix A: Accessories, Service , and Maintenance
105
Standard Accessories
105
Optional Accessories
105
AC Line Operation
105
Battery Charging
106
Battery Operation
107
Battery Pack Replacement
108
Service
109
Temperature Range
110
Warranty
110
Appendix B: Improper Operations
113
Appendix C: Stack Lift and LAST
115
Index
117
4
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HP 25 Specifications
General
Power Source
Rechargeable battery pack
Programming Steps
49
Release Year
1975
Functions
Trigonometric, logarithmic, statistical
Type
Scientific
Dimensions
148 x 80 x 14 mm
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