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HP HP-25 - Page 72

HP HP-25
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press[
[],
the
mean
of
the
values
of
x
is
calculated
using
the
data
in
storage
registers
R,
(n)
and
R;(2x)
and
the
formula:
|
n
;:HE
X
1=1
The
easiest
way
to
accumulate
the
required
data
in
the
appli-
cable
registers
is
through
the
use
of
the
key
as
described
above.
However,
the
required
data
may
also
be
stored
directly
in
storage
registers
R,
(1)
and
R,
(3x),
if
desired.
Example:
A
survey
found
ten
of
the
wealthiest
persons
in
the
United
States
to
have
the
following
ages:
62 84 47 58
68 60
62 59
71
73
To
find
the
average
(mean)
age
of
this
sample
of
wealthy
persons:
Press
Display
=
Storage
registers
and
X-register
cleared
to
zero.
62,84
B,
47
B3,
58
B,
683,60
B3.62E3.
59
.
718,73
Number
of
entries.
i
Average
(mean)
age
in
years.
Standard
Deviation
The
standard
deviation
(a
measure
of
dispersion
around
the
mean)
is
calculated
using
data
in
the
applicable
storage
registers
and
the[](standard
deviation)
key.
Pressing[
!
[S]uses
the
data
in
registers
R,
(1),
Rg
(2x?),
and
R,
(2
x)
to
calculate
the
standard
deviation
according
to
the
formula:
(2x)?
n
n-1
For
example,
to
obtain
the
sample
deviation
in
the
above
problem:

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