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HP HP-67 - Page 121

HP HP-67
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Function
Keys
117
2.
Press
@
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
and
reentered.)
4.
Press
1.
The
correct
values
for
mean
and
standard
deviation
are
now
obtainable
by
pressing
[
and
B
(5).
For
example,
suppose
the
poorer
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
who
is
worth
1300
million
dollars:
Press
Display
@
Accumulations
replaced
in
secondary
storage
registers.
62
1200 Data
to
be
replaced.
o
=]
Number
of
entries
(n)
is
now
five.
21
1300
The
new
data.
Number
of
entries
(n)
is
six
again.
The
new
data
have been
calculated
into
each
of
the
summations
present
in
the
secondary
storage
registers.
To
see
the
new
mean
and
standard
deviation:
Press
Display
B&
1491.67
The
new
average
(mean)
worth.
Q
61.00
The
new
average
(mean)
age
available
in
X-register
for
use.
as
333.79
The
new
standard
deviation
for
worth.

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