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HP HP-25 User Manual

HP HP-25
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The
correct
values
for
mean
and
standard
deviation
are
now
obtainable
by
pressing[7[x]and
7
[5].
For
example,
suppose
the
62-year
old
member
of
the
sample
as
given
above
were
to
lose
his
position
as
one
of
the
wealthiest
persons
because
of
a
series
of
ill-advised
investments
in
cocoa
futures.
To
account
for
the
change
in
data
if
he
were
replaced
in
the
sample
by
a
21-year
old
rock
musician:
Press
Display
62
Data
to
be
replaced.
B
Number
of
entries
(n)
is
now
nine.
21
The
new
data.
Number
of
entries
(n)
is
ten
again.
The
new
data
has
been
calculated
into
each
of
the
summations
present
in
the
storage
registers.
To
see
the
new
mean
and
standard
deviation:
Press
Display
B
The
new
average
(mean)
age.
B
17.09
The
new
standard
deviation.
Vector
Summations
The
key
can
be
used
to
sum
any
quantities
that
are
in
the
X-
and
Y-registers.
You
can
even
perform
vector
addition
and
subtraction
using
rectangular
to
polar
coordinate
conversion
and
the
and
keys.
Example:
In
his
converted
Swordfish
aircraft,
grizzled
bush
pilot
Apeneck
Sweeney
reads
an
air
speed
of
150
knots
and
a
heading
of
045°
from
his
instruments.
The
Swordfish
is
also
being
buffeted
by
a
headwind
of
40
knots
from
a
bearing
of
025°.
What
is
the actual
ground
speed
and
course
of
the
Sword-
fish?
Method:
The
course
and
ground
speed
are
equal
to
the
sum
of
the
instrument
vector
and
the
wind
vector.
The
vectors
are
converted
to
rectangular
coordinates
and
summed
using
the
and
keys.
Their
sum
is
recalled
by
recalling
the
values
in
storage
registers
R,
(X
y)
and
R;
(Y
x),
and
the
new
rectan-
gular
coordinates
are
then
converted
back
to
polar
coordinates

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HP HP-25 Specifications

General IconGeneral
BrandHP
ModelHP-25
CategoryCalculator
LanguageEnglish

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