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Function Keys
67
LY
Summation
of y values.
R5
LXY
Summation of
products
ofx and y
values.
R6
Lx2
Summation of
X2
values
.
R7
LX
Summation of x values.
In
addition
,
the
y-value
present before the
last
press
of
the m
key is retained in
the
Y-register, while the x-value present be-
fore m
was
pressed is retained in the
LAST
X register
.
To
see any of the
summations at any time
,
you
have
only
to re-
call
the
contents of
the desired
storage
register.
(I
n the case
of
the m
key, recalling
storage
register contents
or
keying in
a
number
simply writes
over the number of
entries
(11)
that
is
dis-
played. The
stack
does not lift
.)
Example:
Find
LX
,
Lx2
,
LY,
and
LXY
for the
paired
values ofx
and y
listed below.
Press
a
~
7
mmiD
5m
5
I:mim
3m
9
mmiD
8m
1317
1316
1315
1314
1313
Mean
Display
t
0.00
17.00
I
1
1.00
I
15.00
I
12.00
I
1
9.00
I
13.00
I
116.00
I
198.00
I
1122.00
121 .00
13.00
Ensures
that all
storage
registers
are cleared to
zero
initially
.
(Assumes
no
results remain
from
previous example.)
First pair
is
summed:
11
=
I.
Second
pa
ir
is
summed
:
11
=
2.
All
the
data is summed
;
11
=
3.
Sum ofx values
from
regi
ster R
7
•
Sum of squares of x
va
lue
s
from
register R,;.
Sum of products of x
a
nd
y
values
from regi
ster Ro.
Sum ofy values from regi
ster
Ro!
.
Number of entrie
s
(n
=
3).
The mean
(arithmetic average) of data entered and summed
using
them
key
is
avail
a
ble by using
the
[KJ
(meal1)key. When you
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